From Marco.Leoni at eso.org  Fri Mar  7 08:00:15 2003
From: Marco.Leoni at eso.org (Marco Leoni)
Date: Fri, 07 Mar 2003 17:00:15 +0100
Subject: [Fwd: RE: UCDs - repost]
Message-ID: <3E68C20F.7020700@eso.org>



-------- Original Message --------
Subject: RE: UCDs - repost
Date: Fri, 7 Mar 2003 09:25:19 -0500
From: "Wil O'Mullane" <womullan at skysrv.pha.jhu.edu>
To: registry at ivoa.net



I note in your paper you mention not being able to express functions in an Ontology.
Many years ago I worked with Ontoloigua and KIF(Knowledge Interchange Format)
this indeed allows one to express functions on numbers .
http://logic.stanford.edu/kif/kif.html

Of course KIF is lisp (Lots of Incomprehensilble Silly Brackets indeed) based and not very pretty .

Still I see KSL have now extended Ontalingua in to the web world and suggest provideing it as a Server... it may bear looking at.

Perhaps this has already been explored ..

wil
> 
>   Hello all,
> 
>   Maybe some of you have not subscribed to the 
> ucd at ivoa.net list, but might have interest in
> reading the paper I posted there:
> 
> http://www.ivoa.net/forum/ucd/0001.htm
> 
>   Sorry for those who received this info twice.
> 
> Sebastien.
> -- 
>     _______
>    /  ~   /, Sebastien Derriere   mailto:derriere at astro.u-strasbg.fr
>   / ~~~~ //  Observatoire de Strasbourg    Phone +33 (0) 390 242 444
>  /______//   11, rue de l'universite     Telefax +33 (0) 390 242 417
> (______(/    F-67000 Strasbourg  France


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From amsr at jb.man.ac.uk  Mon Mar 17 08:03:55 2003
From: amsr at jb.man.ac.uk (Anita Richards)
Date: Mon, 17 Mar 2003 16:03:55 +0000 (GMT)
Subject: UCD Status and Perscpectives
Message-ID: <Pine.GSO.4.53.0303171536240.11593@aten>



Sebastien's 'UCD: Status and Perspectives' gives a very clear summary of
the recent discussions, responding on the basis of the considerable
experience of CDS. Thanks very much - I actually enjoyed reading it,
especially the ontology section. It suggests to me some issues which it
would help if we made decisions on, or at least reached a working
agreement for the immediate future. Maybe Sebastien (or anyone) could
suggest what is most urgently needed for discussion at the IVOA registry
meeting Wednesday 19 Mar - is anyone planning a presentation? This is what
occurs to me:

1) Registries needs UCDs.

  'Status and Perspectives'
 discusses relevant issues in '3. UCDs and data models'.  We need
 general UCDs which describe an entire data set ("Header metadata"),
 e.g. for which wavelength regime (Radio, IR, Optical etc) - where
 such currently UCDs exist, they are often parts or parents, rather
 than ones which are instantiated. See e.g.

   [[http://www.stsci.edu/~hanisch/NVO/ResourceServiceMetadataV6.doc][Bob
   Hanisch ResourceServiceMetadataV6.doc]]
or

[[http://www.stsci.edu/~hanisch/NVO/ResourceServiceMetadataV6.pdf][ResourceServiceMetadataV6.pdf]]
   and

[[http://wiki.astrogrid.org/bin/view/Astrogrid/RegistrySchema][AstroGrid
   draft registry schema]]

We also need a means to associate header data with column labels,
e.g. if all data in one catalogue is at 1.4 GHz  and another at
1.6 GHz this currently has two separate column UCDs,
PHOT_FLUX_RADIO_1.4G and PHOT_FLUX_RADIO_1.6G - dozens of UCDs in
all.  Using the atom idea across the header and the columns, this
could be achieved using one column UCD PHOT_FLUX, and header UCDs for
the wavelength regime (radio) and the nominal frequency.  This does
require that we evaluate the data corresponding to UCDs, see below.

2) Evaluating data identified by UCDs

Many people think of UCDs as primarily for selection of catalogues for
a human to then view the contents.  This is their primary funtion as
far as the Registry is concerned, but for actually executing queries
we need to compare values within cagtalogues and possibly associate
the results with a new UCD (e.g. compare flux densities to derive a
colour).

Until recently, UCDs were only evaluated routinely (e.g. via Vizier)
in one of the most difficult cases - coordinate conversion.
Otherwise, the user said 'give me a list of catalogues containing
information about x' and the service converted x into UCDs and
returned a list of catalogues containing columns corresponding to x.
This is now extended to photometry but only for special formats (see
above or the AVO demo).  We now need UCDs which can enable selection
via evaluating UCDs, e.g. if I want flux density measurements between
1.4 and 1.6 GHz I should be able to access data at 1.5 GHz too, via
the registry search seeing there is a catalogue containing radio flux
densities, and the query execution finding OBS_FREQUENCY 1.5 GHz - in
the header, or as a column heading for a collection of measurements at
a range of frequencies, as well as a column PHOT_FLUX.

This may be a problem where one UCD describes several columns
e.g. TIME_DATE for the start and stop of observations, but we want to
evaluate both e.g. for error bars on a proper motion measurement.  Or
do we just need an algorithm which says 'if there are two TIME_DATEs
and they are different, take the difference'?

3. Who reads UCDs?

The document asks 'how do I find the proper UCD to decribe my data
set'. At present, this is done automatically if you are someone
contributing a 'simple' table e.g. out of a paper; the average
astronomer is not _forced_ to be exposed to UCDs, and a user doing a
search certainly isn't (although they might want to use them
directly).  Data providers of major archives may need to investigate
them to check they are allocated correctly or suggest new ones, as do
VO workers. Thus they should be reasonably human-readable and
available for anyone, but not restricted to the lowest common
denominator of astronomical understanding.

We could increase the present number ten or even 100 fold (still
<10^5) - I am not saying we should, but we need to be afraid of it.
For example, if I am using the SED tool in Aladin, I really do not
want to know that an optical data set has UCDs for photometric zero
point and colour corrections (although an optical astronomer might and
I had to learn...) but fortunately the Aladin prototype SED tool knows
how to use these to plot magnitudes in Jy.  Conversely an optical
astronomer does not want to know parameters associated with radio
visibility data but if s/he wants to extract an off-centre image at a
certain resolution from the MERLIN archive, they need the extraction
tool to know about baseline lengths, visibility integration times
etc. to chose a data set with an appropriate field of view and
resolution.

Thus, completeness of UCDs for their purpose is more important than
economy, and in fact the savings in going to an atomic structure would
probably mean we could add UCDs for specific errors, and remove the
degeneracy of things currently under 'TIME_DATE' or 'NUMBER' etc., without
making UCDs unmanagable. As the document says, the creation of new UCDs
should certainly be restricted to defined bodies (e.g. via a central
monitoring panel) to avoid duplication and maintain consistency at a
functional level.  This probably means UCDs will proliferate slowly,
acquire some clumsy ones, and then be pruned or refactored over a cycle of
months or years.

Best wishes

Anita

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Dr. Anita M. S. Richards, AVO Astronomer
MERLIN/VLBI National Facility, University of Manchester,
Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL, U.K.
tel +44 (0)1477 572683 (direct); 571321 (switchboard); 571618 (fax).


From pfo at star.le.ac.uk  Tue Mar 18 05:08:39 2003
From: pfo at star.le.ac.uk (Patricio F. Ortiz)
Date: Tue, 18 Mar 2003 13:08:39 +0000 (GMT)
Subject: UCD Status and Perscpectives
In-Reply-To: <Pine.GSO.4.53.0303171536240.11593@aten>
Message-ID: <Pine.GSO.4.44L0.0303181304590.28327-100000@sparky.star.le.ac.uk>

Hi Anita,

as a reflexion on your thought I wrote the following lines, which I think
may be relevant. I must add that I agree with your points nearly 100% :-)

Cheers,

Patricio

UCDs for the photometric and time domain.


At nearly 5 years since the beginning of the work on UCDs a number
of things have evolved which make it worth re-thinking how these two
observation-related quantities can be represented for the new usages
broght by the advent of the IVO and the possible usages by both human
users or machine users (eg registries).

Both of these variables can be seen as continuous, and one single
observation will cover a certain range in wavelength (frequency) and a
certain range in time.

Historically, the wavelength domain has been split in "bands" by the use of
photometric systems and observing bands in the different domains. UCDs
tried to adjust to this scheme as it is useful to find comparable
quantities in a simple datamining model. What was done was very similar to
have POS_EQ_RA_MAIN_1H, POS_EQ_RA_MAIN_2H... The position in the sky, of
course, was never constrained by instrumental settings and systems.

Today though, we have seen the broad possibilities of searching in
archived data and this scheme attached to UCDs can hardly cope with some
of the newly imposed requirements. The problem is not to add more UCDs to
the system, as that was seen as a clear possibility since the beginning,
but to have a system able to respond in a simple way to queries like
"I want observations in this wavelength regime".  UCDs can (and should)
still be attached to columns for proper characterization of each data
column, but a solution can be found in a similar way to characterizing
the sky coverage (where one can split the sky in arbitrary tiles and
put 1 when observations exist in a given catalogue).

What I propose is a system which represents the whole electromagnetic
spectrum in a linear way. If one takes the space of log(wavelength)
going from 0.003 nm to 3km we have nearly 15 decades of coverage, which
could be split in 1000 parts to give enough spectral resolution.
Each photometric filter and bandpass will be represented by a series of
bits which should be set to 1.

A catalogue which contains Jonhson's V magnitue and B-V colour index
plus some radio data and X-ray data would have a fingerprint where the bits
on will be the ones corresponding to the B and V filters, the radio
bandpass(es) and the X-ray band(s). This information will be part of the
catalogue's metainformation and should be stored in data-centers and
possibly registries to which users will have access.

A user may then submit a query to a registry where s/he can decide which
ranges in the EMS to search for. The registry machine will create a "search
fingerprint" to compare with the catalogues it knows about and/or it could pass
this fingerprint to another grid service which will do its own search. The
user should then receive a list of catalogue handles which satisfy his/her
requirements.

A number of scenarios of search logics can be envisioned, from full
intersection to partial intersection of fingerprints. That is a point we
should develop based on use cases.

I've experimented with a solution where I split the interval (in log) in
15000 bins (1000 per decade) and it gives a reasonably good resolution in
all wavelength regimes. More testing is needed and suggestions are welcome.



The time domain

It presents itself as a similar problem to wavelength. One could define a
starting point, and fix a time resolution, then each timed observation
could be defined by a series of bits set to 1 wherever this observation
falls.

If one were to take 1 day  as the time resolution, 100yrs require  36525 bits
If one were to take 1 hour as the time resolution, 100yrs require 876600 bits

The numbers look large, but one can represent the time coverage of a
catalogue by just a few bits set to 1. Each catalogue time-fingerprint can
be reconstructed on the fly.

Again, a user may form his/her own time-fingerprint to perform searches,
like "I'm interested in recovering data for region X observed in this
period of time or periods separated by one year afterwards", eg, one wants
to measure proper motions.


In summary, by linearizing and binning these two quantities one can
build search engines which give users high flexibility to perform searches
and solve so the problem of multiplying UCDs to high levels.


Patricio F. Ortiz


On Mon, 17 Mar 2003, Anita Richards wrote:
>
>
> Sebastien's 'UCD: Status and Perspectives' gives a very clear summary of
> the recent discussions, responding on the basis of the considerable
.....

---
Dr. Patricio F. Ortiz			pfo at star.le.ac.uk
AstroGrid project
Department of Physics and Astronomy
University of Leicester			Tel: +44 (0)116 252 2015
LE1 7RH, UK


From jcm at head-cfa.cfa.harvard.edu  Wed Mar 19 05:36:13 2003
From: jcm at head-cfa.cfa.harvard.edu (jcm at head-cfa.cfa.harvard.edu)
Date: Wed, 19 Mar 2003 08:36:13 -0500 (EST)
Subject: UCD Status and Perspectives
Message-ID: <200303191336.h2JDaDs05535@urania.cfa.harvard.edu>


Dear Patricio,

 I think your suggestion ("UCDs for the photometric and time domain")
works well for search engines and catalog queries, but it does not work 
to describe the data precisely enough to do on-the-fly interconversions
("match this table with fluxes at 4100A to this other table with fluxes
at 4200A assuming a spectral index of 0.7") at the level of accuracy  
wanted for data analysis, never mind the problem of "convert this kind 
of B filter to this slightly different kind of B filter".  Maybe that's
OK, but in that case some other language analogous to UCDs will be
needed for robust data description and we should be clear that UCDs will
only apply to the query process (indeed their current and original
intention).

Anita's comments are well taken, but perhaps she can clarify:
you are suggesting replacing PHOT_FLUX_RADIO_1.4G with PHOT_FLUX
and a header UCD of OBS_FREQUENCY 1.4 GHz, right? But what if you
have three flux columns in the catalog, ( a bit like the problem
you alluded to of TIME_DATE for start and stop), say PHOT_FLUX_RADIO_1.4G
and PHOT_FLUX_RADIO_5.0G and PHOT_FLUX_RADIO_22.0G? Then we need three
OBS_FREQUENCY header UCDs and a way to map them to the respective columns
- which is essentially the 'parameterized UCD' I have suggested elsewhere.

 - Jonathan McDowell


From pfo at star.le.ac.uk  Wed Mar 19 06:18:43 2003
From: pfo at star.le.ac.uk (Patricio F. Ortiz)
Date: Wed, 19 Mar 2003 14:18:43 +0000 (GMT)
Subject: UCD Status and Perspectives
In-Reply-To: <200303191336.h2JDaDs05535@urania.cfa.harvard.edu>
Message-ID: <Pine.GSO.4.44L0.0303191353050.16092-100000@sparky.star.le.ac.uk>

Dear Jonathan,

On Wed, 19 Mar 2003 jcm at head-cfa.cfa.harvard.edu wrote:
> Dear Patricio,
>
>  I think your suggestion ("UCDs for the photometric and time domain")
> works well for search engines and catalog queries, but it does not work
> to describe the data precisely enough to do on-the-fly interconversions
> ("match this table with fluxes at 4100A to this other table with fluxes
> at 4200A assuming a spectral index of 0.7") at the level of accuracy
> wanted for data analysis, never mind the problem of "convert this kind
> of B filter to this slightly different kind of B filter".  Maybe that's
> OK, but in that case some other language analogous to UCDs will be
> needed for robust data description and we should be clear that UCDs will
> only apply to the query process (indeed their current and original
> intention).

I couldn't agree more with you on this point. Discovering the existence of
information is one issue, which could be solved with the scheme I proposed,
and with UCDs but converting or transforming quantities is a completely
different ball game.  As we discussed in the meeting at CfA, full
characterization of the filters and bandpasses should be achieved before
attempting the conversion and a lot of "knowledge" or expertise will be
required for us to get to this point.

Can you expand on your first example please? "match this table with
fluxes at 4100A to this other table with fluxes at 4200A assuming a
spectral index of 0.7" What do you have in mind? Do you want to match by
position first and then find the sources which have similar fluxes based on
4100 and 4200 band?

I find your example quite interesting, that's why I'd like to know more
what you have in mind.

>
> Anita's comments are well taken, but perhaps she can clarify:
> you are suggesting replacing PHOT_FLUX_RADIO_1.4G with PHOT_FLUX
> and a header UCD of OBS_FREQUENCY 1.4 GHz, right? But what if you
> have three flux columns in the catalog, ( a bit like the problem
> you alluded to of TIME_DATE for start and stop), say PHOT_FLUX_RADIO_1.4G
> and PHOT_FLUX_RADIO_5.0G and PHOT_FLUX_RADIO_22.0G? Then we need three
> OBS_FREQUENCY header UCDs and a way to map them to the respective columns
> - which is essentially the 'parameterized UCD' I have suggested elsewhere.
>
>  - Jonathan McDowell

Although the last question is for Anita, let me jump in the case as
well.  If I understand well enough, when you produce a catalogue which
contain observations in one frequency (band) one might think in calling
the column PHOT_FLUX and qualify the whole catalogue. Well, that was
exactly the situation we found in the published data. Tables made full
sense when attached to their paper, and even the table name could tell
us what band someone was observing. There were hundreds of tables where
the column name was "Mag"; taking the table out of context (like in a
table depository) one had no idea what this Mag meant, that's why UCDs
were introduced, to solve this kind of degeneracy. I feel that if we do so
with UCDs we'll go backwards in a sense.

Jonathan, can you point me to a document with your proposed 'parameterized
UCD'? I just searched with google and got nowhere :-(

Cheers,

Patricio

---
Dr. Patricio F. Ortiz			pfo at star.le.ac.uk
AstroGrid project
Department of Physics and Astronomy
University of Leicester			Tel: +44 (0)116 252 2015
LE1 7RH, UK


From Markus.Dolensky at eso.org  Thu Mar 20 07:58:55 2003
From: Markus.Dolensky at eso.org (Markus Dolensky)
Date: Thu, 20 Mar 2003 16:58:55 +0100
Subject: UCDs status and perspectives
References: <200303201516.h2KFG7P07723@rosetta.saclay.cea.fr>
Message-ID: <3E79E53F.3050209@eso.org>


Hi Pierre,

I couldn't agree more on the notion of your second point:

 > 2) Adding UCD.
 >
 > As Patricio said, "the problem is not to add more UCDs", everbody
 > would agree on that, but it is certainly _how_ to perform
 > the metadata bank update, when _really_ needed.
 > A very strict and tedious approvment by an "expert group",
 > as proposed in sebastien's doc, is certainly not appropriate
 > for a lot of cases, where quick even instantaneous
 > response is needed.
 > Once more, migrating to parametrized atomic Descr (PAD?),
 > will perhaps facilitate their dynamic handling.

It would be great if we could agree on some rules for using UCDs rather 
than looking at them individually. This might not be fully in line with 
the original idea when UCDs were invented as some sort of table column 
identifiers. The scope, however, is much broader now - it's about meta 
data in a more general sense. We need them in the registry, as query 
specifiers, as a way for interpreting VOTable docs, as tags in data 
models, ...

Markus

+---
| Markus Dolensky   Mailto:Markus.Dolensky at eso.org
| AVO Technical Lead          Web: www.euro-vo.org
| Voice: ++49 89 32006/261  Fax: ++49 89 32006/480
+---



From dide at discovery.saclay.cea.fr  Thu Mar 20 07:16:07 2003
From: dide at discovery.saclay.cea.fr (DIDELON Pierre)
Date: Thu, 20 Mar 2003 16:16:07 +0100 (MET)
Subject: UCDs status and perspectives
Message-ID: <200303201516.h2KFG7P07723@rosetta.saclay.cea.fr>


Hello UCD Fan's and Pro's,

the ongoing discussion seems very promising to me,
and the experts certainly have a goog understanding
of that's going on. Nevertheless I would like to make 
comments on three recurrent subjects. My point of view
is perhaps obvious and trivial, but as UCD, and more
generaly ontology, try to make implicit assumption
became explicit, I felt free to post the following.

The points are related to the UCD handling, 
the way of adding UCD,
and UCD usage at different levels.

1) UCD Handling

I was very happy to read the following in Sebastien's doc.
"The hierchical tree is not fundamental - 
it's merely a way of classification". What is actually very 
important for me is the knowledge base represented by
the UCDs, which certainly describe very well, even if not 
exhaustively the columns of astronomical catalogs.
The ways, different people want to look at this metadata
pond/container will certainly be differents.
But actually the UCD structure and even the name structure itself
does not promote or facilitate others point of view on this
fabulous metadata bank.
But as stressed also in sebastien's doc, "it is clear that 
the definition of right roots does not exist, and is influenced
by the user's own needs". 
It means that a static absolute and final UCD structuration
is not realistic, and so "different structures corresponding to
different views" of UCD must coexist.
It is one more argument in addition to a parametrized and atomic 
definition of Descriptors. 

2) Adding UCD.

As Patricio said, "the problem is not to add more UCDs", everbody
would agree on that, but it is certainly _how_ to perform
the metadata bank update, when _really_ needed.
A very strict and tedious approvment by an "expert group",
as proposed in sebastien's doc, is certainly not appropriate
for a lot of cases, where quick even instantaneous
response is needed.
Once more, migrating to parametrized atomic Descr (PAD?),
will perhaps facilitate their dynamic handling.
To clarify my point of view, perhaps a little bit too broad 
and common, let's take an example.

Try to imagine a Web service which can create data on the flight
and must be able to assign UCDs to these _dynamic_ data.
A very simple example would be a data bank of SED or photometric data
covering a very wide spectral range, and which can delivered 
a flux, mag, color or anyelse sensible combined data at whatever
wavelength required by the user. This service don't want 
to register one predifine UCD for any data conmbination
but needs only to parametrize the UCD and perhaps, in the most
complex case re-organize the basic predifined atoms.

Then the atoms definitions and the combination rules allowed
must be approved by an "expert group", but the parameter s
and the combinations used can be freely adapted by each
data provider, portal or anyelse service or tool.

3) UCD usage at different level

As already mention by sebastien and anita, any UCD
used as column description in one dataset can be used
as header or global metadata in another dataset,
and some times an association between these two uses
must be performed.
To my feeling the answer already exist in the VOTable 
structure. UCDs exist in two class, FIELD and PARAM.
And it is obvious that they are specialization of a more
general class which could be called vardescr (variables descriptors).
In the particular case of PARAM instances, the values are
attached to the description, while for the FIELD
the data link is more loosely. Adressing this more general
class would certainly facilitate the association between
global/header metadata and column description.
The main problem is that UCD are historically concerned
with column descriptors and so cover very well this field
of interest but it is not obvious how exhaustive are the
existing UCD to cover the needs of global metadata
used in headers (Fits) or definitions (VOTable).

I hope that these comments are not out of scope,
and that the expression of my feelings are not
unpleasant to anybody.

Sincerely yours,
Pierre Didelon









From dide at discovery.saclay.cea.fr  Thu Mar 20 08:25:38 2003
From: dide at discovery.saclay.cea.fr (DIDELON Pierre)
Date: Thu, 20 Mar 2003 17:25:38 +0100 (MET)
Subject: UCDs status and perspectives
Message-ID: <200303201625.h2KGPcu07938@rosetta.saclay.cea.fr>


> From Markus.Dolensky at eso.org Thu Mar 20 17:01:00 2003
> To: DIDELON Pierre <dide at discovery.saclay.cea.fr>
> CC: ucd at ivoa.net
> Subject: Re: UCDs status and perspectives
> 
> Hi Pierre,
> 
> I couldn't agree more on the notion of your second point:
> 
>  > 2) Adding UCD.
>  >
>  > As Patricio said, "the problem is not to add more UCDs", everbody
>  > would agree on that, but it is certainly _how_ to perform
>  > the metadata bank update, when _really_ needed.
>  > A very strict and tedious approvment by an "expert group",
>  > as proposed in sebastien's doc, is certainly not appropriate
>  > for a lot of cases, where quick even instantaneous
>  > response is needed.
>  > Once more, migrating to parametrized atomic Descr (PAD?),
>  > will perhaps facilitate their dynamic handling.
> 
> It would be great if we could agree on some rules for using UCDs rather 
> than looking at them individually.
 
I totally agree. What I had in mind  is not a traduction one by one of all
the existing UCD, but the definition of atoms and parameters which allow
to handle the existing UCD in a more flexible way. 
So, PAD can point to UCD, but the reverse would perhaps not always be true. 
But it is not clear to me, if the two systems coexists in the future,
which will be the needs of update synchronism and joined maintenance!

>...This might not be fully in line with 
> the original idea when UCDs were invented as some sort of table column 
> identifiers. The scope, however, is much broader now 

That's why PAD is perhaps more appropriate than UCD, because we no longer
deal only with column descriptors but with _global_ metadata.

>...- it's about meta 
> data in a more general sense. We need them in the registry, as query 
> specifiers, as a way for interpreting VOTable docs, as tags in data 
> models, ...
> 
> Markus
> 

Sorry for being unclear with rough english,
cordially,
Pierre


From borne at rings.gsfc.nasa.gov  Tue Mar 25 14:30:55 2003
From: borne at rings.gsfc.nasa.gov (Kirk Borne)
Date: Tue, 25 Mar 2003 17:30:55 -0500 (EST)
Subject: UCDs status and perspectives
Message-ID: <200303252230.RAA09366@rings.gsfc.nasa.gov>

Ray:  I believe that your suggestions carry a lot of merit.  I had a
nagging feeling when reading Jonathan's comments that our metadata
efforts could easily diverge (as you suggest) if we are not careful.
The data model is key to this -- consequently, the ability of XML
Schema to carry the knowledge about both the data model and the
metadata relationships, using standardized techniques, makes a lot
of sense -- especially with regard to reconciling the two metadata
approaches that you mention.  I think that disaster can be averted,
and Jonathan's and your suggestions can illuminate the way.  The
PHOT_FLUX(PHOT_BAND_ID) is an excellent example of the problem
and a good solution.

- Kirk


> Date: Tue, 25 Mar 2003 15:15:13 -0600 (CST)
> From: Ray Plante <rplante at poplar.ncsa.uiuc.edu>
> To: ucd at ivoa.net
> Subject: Re: UCDs status and perspectives
> 
> We have been bouncing around in our community two models for tagging
> metadata that we will eventually need to reconcile.  One is essentially
> XML-based and the other is based on the current UCD set.  The former makes
> the most sense for descriptions stored in a registry, while the latter is
> useful for tagging a set of data (e.g. in a table column).  Both are
> important and necessary.  Both reflect a common data model.  However, it
> would inconvenient if not disasterous if there were not a direct
> correlation between to two representations.
> 
> I feel the answer can be found in existing XML technologies.  I would 
> claim that the atomic descriptors being discussed (PAD, PCD, etc.) are 
> really just a short hop from an XML model.  The main thing that PCD has 
> in common with XML tags is that both are essentially pointers into a 
> data model.  The main difference between them is that with a UCD/PCD, we 
> need that pointer to be representable as a simple string (e.g. that can be 
> put in the ucd attribute in a VOTable).  
> 
> XML has such a pointer; it's called an XPath.  If we define the data 
> model as an XML Schema, then our UCD/PCDs fall right out.  There are other 
> advantages:
>   *  XML Schema provides a machine readable form for a data dictionary.
>   *  The extensibility of XML schemas provides the extensibility for 
>      UCDs automatically.  
>   *  When necessary, metadata in direct XML form (as envisioned in a 
>      registry) into UCD-tagged VOTable data.  
>   *  The modeling that Jonathan proposed is largely still applicable.
>   *  The approach is consistant with the data modeling activities that 
>      have been done to date.
> 
> As an example, consider the example Jonathan cited:
> 
> > For instance the two UCDs PHOT_FLUX_RADIO_1.4G
> > and PHOT_FLUX_RADIO_1.6G would map to a single PCD
> > PHOT_FLUX(PHOT_BAND_ID) with PHOT_BAND_ID taking the values 1.4 GHz and
> > 1.6 GHz. 
> 
> Suppose a data model defined more or less in the following way:
> 
>  <element name="PHOT">     
>    <complexType>           
>      <sequence>            
>        <element name="FLUX" type="fluxValue"/>  <!-- fluxValue and freqValue 
-->
>        <element name="FREQ" type="freqValue/>   <!--   defined elsewhere     
-->
>      </sequence>           
>    </complexType>          
>  </element>                
> 
> In direct XML, such a flux would be rendered as:
> 
>  <PHOT>
>    <FREQ>1.6 GHz</FREQ>
>    <FLUX>0.25 GHz</VALUE>
>  </PHOT>
> 
> The XPath pointing to the flux value would be:
> 
>   PHOT[FREQ='1.6 GHz']/FLUX
> 
> Note that there doesn't need to a direct XML representation like the
> one shown above for the XPath to carry meaning; it points into a data
> model describing Photometry.  
> 
> To make this model work, I think we need to...
>   * set some restrictions on how metadata are defined in XML Schema.
>     We may consider avoiding the defining attributes; this would make
>     XPaths simpler and it would integrate into SOAP more easily.
> 
>   * devise a consistant pattern representing measurements (i.e. value
>     and unit).  I'm *not* recommending the form in the above example.
> 
>   * build data models from the bottom up starting with common concepts
>     (e.g. physical quantities) that can be reused in different
>     contexts.  (Jonathan's model is relevent here.)  A freqency
>     should be represented the same way whether it is describing a flux
>     measurement or a bandwidth.  
> 
> cheers,
> Ray


+------------------------------------+-------------------------------------+
| Dr. Kirk D. Borne                  | mailto:Kirk.Borne at gsfc.nasa.gov     |
| Institute for Science & Technology, Raytheon (IST at R)                     |
| NASA Goddard Space Flight Center   |                                     |
| Astrophysics Data Facility         | Phone: 301-286-0696                 |
| Code 631                           |     or 301-286-2772:Kathy Starling  |
| Greenbelt, MD  20771               | FAX:   301-286-1771                 |
+------------------------------------+-------------------------------------+
  US Virtual Observatory:  http://us-vo.org/
  Staff page:     http://rings.gsfc.nasa.gov/~borne/bio_borne_kirk.html


From rplante at poplar.ncsa.uiuc.edu  Tue Mar 25 13:15:13 2003
From: rplante at poplar.ncsa.uiuc.edu (Ray Plante)
Date: Tue, 25 Mar 2003 15:15:13 -0600 (CST)
Subject: UCDs status and perspectives
In-Reply-To: <200303250343.h2P3hJN18502@urania.cfa.harvard.edu>
Message-ID: <Pine.LNX.4.44.0303251350530.7434-100000@poplar.ncsa.uiuc.edu>

We have been bouncing around in our community two models for tagging
metadata that we will eventually need to reconcile.  One is essentially
XML-based and the other is based on the current UCD set.  The former makes
the most sense for descriptions stored in a registry, while the latter is
useful for tagging a set of data (e.g. in a table column).  Both are
important and necessary.  Both reflect a common data model.  However, it
would inconvenient if not disasterous if there were not a direct
correlation between to two representations.

I feel the answer can be found in existing XML technologies.  I would 
claim that the atomic descriptors being discussed (PAD, PCD, etc.) are 
really just a short hop from an XML model.  The main thing that PCD has 
in common with XML tags is that both are essentially pointers into a 
data model.  The main difference between them is that with a UCD/PCD, we 
need that pointer to be representable as a simple string (e.g. that can be 
put in the ucd attribute in a VOTable).  

XML has such a pointer; it's called an XPath.  If we define the data 
model as an XML Schema, then our UCD/PCDs fall right out.  There are other 
advantages:
  *  XML Schema provides a machine readable form for a data dictionary.
  *  The extensibility of XML schemas provides the extensibility for 
     UCDs automatically.  
  *  When necessary, metadata in direct XML form (as envisioned in a 
     registry) into UCD-tagged VOTable data.  
  *  The modeling that Jonathan proposed is largely still applicable.
  *  The approach is consistant with the data modeling activities that 
     have been done to date.

As an example, consider the example Jonathan cited:

> For instance the two UCDs PHOT_FLUX_RADIO_1.4G
> and PHOT_FLUX_RADIO_1.6G would map to a single PCD
> PHOT_FLUX(PHOT_BAND_ID) with PHOT_BAND_ID taking the values 1.4 GHz and
> 1.6 GHz. 

Suppose a data model defined more or less in the following way:

 <element name="PHOT">     
   <complexType>           
     <sequence>            
       <element name="FLUX" type="fluxValue"/>  <!-- fluxValue and freqValue -->
       <element name="FREQ" type="freqValue/>   <!--   defined elsewhere     -->
     </sequence>           
   </complexType>          
 </element>                

In direct XML, such a flux would be rendered as:

 <PHOT>
   <FREQ>1.6 GHz</FREQ>
   <FLUX>0.25 GHz</VALUE>
 </PHOT>

The XPath pointing to the flux value would be:

  PHOT[FREQ='1.6 GHz']/FLUX

Note that there doesn't need to a direct XML representation like the
one shown above for the XPath to carry meaning; it points into a data
model describing Photometry.  

To make this model work, I think we need to...
  * set some restrictions on how metadata are defined in XML Schema.
    We may consider avoiding the defining attributes; this would make
    XPaths simpler and it would integrate into SOAP more easily.

  * devise a consistant pattern representing measurements (i.e. value
    and unit).  I'm *not* recommending the form in the above example.

  * build data models from the bottom up starting with common concepts
    (e.g. physical quantities) that can be reused in different
    contexts.  (Jonathan's model is relevent here.)  A freqency
    should be represented the same way whether it is describing a flux
    measurement or a bandwidth.  

cheers,
Ray


From amsr at jb.man.ac.uk  Wed Mar 26 04:09:57 2003
From: amsr at jb.man.ac.uk (Anita Richards)
Date: Wed, 26 Mar 2003 12:09:57 +0000 (GMT)
Subject: UCDs status and perspectives 
Message-ID: <Pine.GSO.4.53.0303261146390.2671@adikia>


Jonathan, Patricio et al:

Regarding Jonathan's example of a table with measurements of flux density
at 3 (or more) frequencies, and Patricio's comments,
http://www.ivoa.net/forum/ucd/0006.htm
I indeed think we should get away from PHOT_FLUX_RADIO_1.4G or anything
like that, and instead have some way of identifying a flux density
measurement with the frequency at which it was made, without having a
separate UCD for every frequency anyone uses. In the long run
Ray's proposal http://www.ivoa.net/forum/ucd/0011.htm  to use Xpath seems
exactly right, that is what I was trying to say in words (i.e. we need
values and attributes etc.).

However, is there a means of transition from the present use of UCDs, e.g.
by associating columns
FREQ  FLUX_DENSITY FLUX_DENSITY_ERROR
GHz      mJy           mJy
1.4     5              1
4.8     10             1
22.0    20             3

or whatever?

I suppose there are two problems here; firstly, to respond to Sebastien's
summary of the present discussion around UCDs - to see how much consensus
there is on what one would like in an idea world - and there seems to be
general agreement on the most general data models at least, different
groups may need more detail in different aspects but all the discussions
seem to be moving in the same direction.

Secondly, however, how much can be done 'seamlessly' based on the
existing, working CDS UCD system?  It is important to keep that going, not
just because astronoemrs depend on it and want to see it do these things
they hear about in reports from VO meetings, but because we need to test
developments on the community as much as possible, and we will find
subjects much more easily if we can give people prototypes which look as
familiar as possible (as with the AVO demo).  Also many new functions e.g.
the SED tool and VOPlot are being developed based on the existing UCDs.
Is this possible, is this the direction in which IDHA is going? Or will
there come a break point, and if so, when?

cheers
a



- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Dr. Anita M. S. Richards, AVO Astronomer
MERLIN/VLBI National Facility, University of Manchester,
Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL, U.K.
tel +44 (0)1477 572683 (direct); 571321 (switchboard); 571618 (fax).


From borne at rings.gsfc.nasa.gov  Wed Mar 26 04:24:32 2003
From: borne at rings.gsfc.nasa.gov (Kirk Borne)
Date: Wed, 26 Mar 2003 07:24:32 -0500 (EST)
Subject: UCDs status and perspectives 
Message-ID: <200303261224.HAA13806@rings.gsfc.nasa.gov>

Anita:  To answer your question about associating columns
(such as FREQ, FLUX_DENSITY, FLUX_DENSITY_ERROR in your example),
the answer is Yes.  XML Schema provide a natural mechanism
for such associations.  Before being shut down by NASA HQ,
the ADC had gone a long way toward building a full XML Schema
for astronomical data tables, which naturally accounted for
such table column associations that astronomers love to put
into their published papers.  What you see in print can be
hierarchically and syntactically rich.  How one builds that 
information into the Schema so that the column associations 
(including parents and children of split columns) is a
completely solvable problem.

- Kirk 
+------------------------------------+-------------------------------------+
| Dr. Kirk D. Borne                  | mailto:Kirk.Borne at gsfc.nasa.gov     |
| Institute for Science & Technology, Raytheon (IST at R)                     |
| NASA Goddard Space Flight Center   |                                     |
| Astrophysics Data Facility         | Phone: 301-286-0696                 |
| Code 631                           |     or 301-286-2772:Kathy Starling  |
| Greenbelt, MD  20771               | FAX:   301-286-1771                 |
+------------------------------------+-------------------------------------+
  US Virtual Observatory:  http://us-vo.org/
  Staff page:     http://rings.gsfc.nasa.gov/~borne/bio_borne_kirk.html


> Date: Wed, 26 Mar 2003 12:09:57 +0000 (GMT)
> From: Anita Richards <amsr at jb.man.ac.uk>
> To: ucd at ivoa.net
> Subject: Re: UCDs status and perspectives 
> 
> Jonathan, Patricio et al:
> 
> Regarding Jonathan's example of a table with measurements of flux density
> at 3 (or more) frequencies, and Patricio's comments,
> http://www.ivoa.net/forum/ucd/0006.htm
> I indeed think we should get away from PHOT_FLUX_RADIO_1.4G or anything
> like that, and instead have some way of identifying a flux density
> measurement with the frequency at which it was made, without having a
> separate UCD for every frequency anyone uses. In the long run
> Ray's proposal http://www.ivoa.net/forum/ucd/0011.htm  to use Xpath seems
> exactly right, that is what I was trying to say in words (i.e. we need
> values and attributes etc.).
> 
> However, is there a means of transition from the present use of UCDs, e.g.
> by associating columns
> FREQ  FLUX_DENSITY FLUX_DENSITY_ERROR
> GHz      mJy           mJy
> 1.4     5              1
> 4.8     10             1
> 22.0    20             3
> 
> or whatever?
> 
> I suppose there are two problems here; firstly, to respond to Sebastien's
> summary of the present discussion around UCDs - to see how much consensus
> there is on what one would like in an idea world - and there seems to be
> general agreement on the most general data models at least, different
> groups may need more detail in different aspects but all the discussions
> seem to be moving in the same direction.
> 
> Secondly, however, how much can be done 'seamlessly' based on the
> existing, working CDS UCD system?  It is important to keep that going, not
> just because astronoemrs depend on it and want to see it do these things
> they hear about in reports from VO meetings, but because we need to test
> developments on the community as much as possible, and we will find
> subjects much more easily if we can give people prototypes which look as
> familiar as possible (as with the AVO demo).  Also many new functions e.g.
> the SED tool and VOPlot are being developed based on the existing UCDs.
> Is this possible, is this the direction in which IDHA is going? Or will
> there come a break point, and if so, when?
> 
> cheers
> a
> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> Dr. Anita M. S. Richards, AVO Astronomer
> MERLIN/VLBI National Facility, University of Manchester,
> Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL, U.K.
> tel +44 (0)1477 572683 (direct); 571321 (switchboard); 571618 (fax).


From rplante at poplar.ncsa.uiuc.edu  Wed Mar 26 07:22:13 2003
From: rplante at poplar.ncsa.uiuc.edu (Ray Plante)
Date: Wed, 26 Mar 2003 09:22:13 -0600 (CST)
Subject: UCDs status and perspectives 
In-Reply-To: <Pine.GSO.4.53.0303261146390.2671@adikia>
Message-ID: <Pine.LNX.4.44.0303260905221.7434-100000@poplar.ncsa.uiuc.edu>

Hi,

> However, is there a means of transition from the present use of UCDs, e.g.
> by associating columns
> FREQ  FLUX_DENSITY FLUX_DENSITY_ERROR
> GHz      mJy           mJy
> 1.4     5              1
> 4.8     10             1
> 22.0    20             3
> 
> or whatever?

The need to associate columns and attach a collective meaning to them is
an issue that has come up numerous times.  The obvious case is that of RA
& Dec values that are stored in separate columns; however, as the above
example implies, the problem is more general.

In the NVO project, we have discussed ways in which VOTable might be 
extended to include descriptions of so-called "frames" (as in reference 
frame) that encapsulates these associations.  This would be made easier if 
it were possible to use exented metadata (e.g. Arnold's space-time 
coordinates schema).  We've discussed XML mechanisms to allow this; I 
think the next step, if we want to pursue this, is for someone to make a 
proposal.

> Secondly, however, how much can be done 'seamlessly' based on the
> existing, working CDS UCD system?  It is important to keep that going, not
> just because astronoemrs depend on it and want to see it do these things
> they hear about in reports from VO meetings, but because we need to test
> developments on the community as much as possible, and we will find
> subjects much more easily if we can give people prototypes which look as
> familiar as possible (as with the AVO demo).  Also many new functions e.g.
> the SED tool and VOPlot are being developed based on the existing UCDs.

I completely agree.  It will take some time to shake out a refactored 
model that covers everything already in the current UCDs.  Therefore, we 
will need a mechanism for continuing to support UCDs as they are now.

It's important to note that the current UCDs represent the most 
practical use-case as they were drawn directly from real catalogs.  As we 
build up more complicated models, e.g. photometry measurements, even 
images, we will need to make sure that the relevent UCD concepts are 
covered.  In fact, that could be made a formal of the definition process.

cheers,
Ray


From roy at cacr.caltech.edu  Wed Mar 26 08:19:13 2003
From: roy at cacr.caltech.edu (Roy Williams)
Date: Wed, 26 Mar 2003 08:19:13 -0800
Subject: Fw: UCDs and XML
Message-ID: <003a01c2f3b3$727a2be0$6601a8c0@roxy>

My thinking on UCD is going around the idea of "recognition".

In writing code for VO applications, I am looking for specific UCDs. Reading
the result of a cone search means finding the POS_EQ_RA_MAIN. Reading the
result of a SIAP means looking for the UCD called VOX:Image_AccessReference.

Therefore it should be allowed to have multiple UCDs describing the same
attribute, so that different applications can recognize and use it. One
person sees a galaxy, another sees a database record, another sees
clip-art -- but it's all the same entity underneath.

This recognition idea allows us to use UCD to subclass objects. If I have a
table from a cone search, then it must have UCDs corresponding to RA, Dec,
ID. Let us subclass this, for example, to a service that returns black-hole
candidates. In this case, we would expect further UCDs to be present:
BH_mass and BH_Spin.

There is a lot that can be done with UCD, and the real question is how to
allow this semantic flexibility to blossom, but without having everyone make
their own UCD and losing all interoperability!

Roy

---
Caltech Center for Advanced Computing Research
roy at cacr.caltech.edu
626 395 3670


From jcm at head-cfa.cfa.harvard.edu  Mon Mar 24 19:43:19 2003
From: jcm at head-cfa.cfa.harvard.edu (jcm at head-cfa.cfa.harvard.edu)
Date: Mon, 24 Mar 2003 22:43:19 -0500 (EST)
Subject: UCDs status and perspectives
Message-ID: <200303250343.h2P3hJN18502@urania.cfa.harvard.edu>

Dear UCD list,
 Following the discussion of last week, I append below some notes
on a controlled vocabulary related to UCDs that I sent to Sebastien
some time ago. It represents a more radical change than most people are
probably ready to go for, but I think it may be relevant to the current
discussion.

 - Jonathan McDowell

 --------------------------------------------------------------------

 I've been thinking a lot this week about UCDs and their possible
role in VO data models. My conclusion is that while the present design
of UCDs is very useful for the catalog cross matching problem, we need
a somewhat more flexible data dictionary to handle the data analysis
problem. I think we need both kinds of dictionary, with of course
a mapping between the two for the applications that need the appropriate
ones.

Specifically, I propose to parallel the UCDs with PCDs (Parameterized
Content Descriptors). These differ from UCDs in that they can include
functional parameters. For instance the two UCDs PHOT_FLUX_RADIO_1.4G
and PHOT_FLUX_RADIO_1.6G would map to a single PCD
PHOT_FLUX(PHOT_BAND_ID) with PHOT_BAND_ID taking the values 1.4 GHz and
1.6 GHz. This reflects the fact that PHOT_FLUX_RADIO_1.4G and
PHOT_FLUX_RADIO_1.6G do not really describe fundamentally different
physical quantities. The PCD also differ from UCD in that they are
organized to  form the bottom level attributes of a structured data
model for astronomy, so the top level domains are different from the
UCDs.

So far my proposed main PCD fields are

(1) about the universe
PHYS Physical data which is true generally and not a property of a 
     specific astronomical location or object.
POP  Properties of a population of astronomical objects
SAMPLE Properties of a sample of sources.
OBJ  The things we study are astronomical objects in space
      (with more or less defined boundaries).
MED  To understand the physics of these objects we describe the physical
     medium constituting them, including matter (solid, liquid, gas, plasma),
     radiation, and electromagnetic, gravitational and other fields.
LOS  A direction on the sky we observe corresponds to a line of sight
     along which objects may lie.    

(2) about our observations of the universe
SRC  When we have a dataset, we can identify a subset of that dataset
     as a source, which we can identify with an object.
     PCDs are SRC when they are to do with the direct measurements of an
     object with a telescope,
     and OBJ when they are to do with the intrinsic properties of the
     object (in its rest frame, without LOS effects etc).
BKG  A special sort of source we call the background
OBS  We have to describe things to do with the observing instrument,
     configuration and conditions.
     (a major subset is OBS_COV_ which )
SURVEY_ A group of observations
SRC_PHOT We measure the absolute intensity of radiation from the sky
SRC_SPEC Like PHOT, but dealing with many photon energies at once?
EVENT A detected photon or background event
_POS  Information about positions (also OBJ_POS etc)
_TIME Information about times (also in OBS_COV_TIME...?)

(3) about our analysis of the observations

DATA We also need to describe things about the datasets themselves.
REFER Bibliographic info

Below I give my first attempt at mapping the UCDs to a data model
oriented set of PCDs. There are quite a few UCDs that I still have to
understand by looking at their actual use in catalogs, so this is only a
sketch and some are left blank. At the end I give the beginnings of
extra UCD/PCD names needed for X-ray astronomy datasets.

Appendix 1: A possible list of PCDs to be the data model equivalent of UCDs.
Given in UCD alphabetical order.

PHYS_AT_                          AT                               Atomic Data
PHYS_AT_COLL                      AT_COLL                        Atomic Collisional Quantities
PHYS_AT_COLL_RATE                 AT_COLL_EXCIT-RATE           Collisional Excitation Rate
# Is this an atom prop or a line prop?
PHYS_AT_COLL_STRENGTH             AT_COLL_STRENGTH             Collisional strength
PHYS_AT_CONFIG    .               AT_CONFIG                      Electronic Configuration
PHYS_AT_CONST?                    AT_CONSTANT                    Atomic Constant
PHYS_AT_DAMPING_                  AT_DAMPING                     Atomic Damping Quantities
PHYS_AT_DAMPING_VDW               AT_DAMPING_VDWAALS           Van der Waals damping
?                                 AT_DATA                        Various Atomic data
PHYS_AT_DEGEN?                    AT_DEGENERACY                  Atomic Degeneracy Parameter
PHYS_AT_DIPOLE_?                  AT_DIPOLE                      Atomic Dipole
?                                 AT_DIPOLE_MISC               Atomic Dipole
PHYS_AT_DIPOLE_MOMENT             AT_DIPOLE_MOMENT             Atomic Dipole Moment
PHYS_AT_EIGENVECTOR               AT_EIGENVECTOR                 Atomic Eigenvector
PHYS_AT_ELECCOEFF                 AT_ELEC-COEFF                  Atomic Electric Coefficient
PHYS_AT_ELEMENT                   AT_ELEMENT                     Atomic Element Name or number, eventually with ionization stage
# See also PHYS_AT_Z
PHYS_PLASMA_EMISSIVITY_AT         AT_EMISSIVITY                  Atomic Emissivity
#What does this mean? It's a function of physical conditions.
#It's a property of the plasma expressed on a per-atom basis.
#So it's not PHYS_AT_EMISSIVITY but
#eg PHYS_PLASMA_EMISSIVITY_AT(Z,T,n)
PHYS_AT_ENERGY_                   AT_ENERGY                      Atomic Energy or Potential
#Heterogeneous class?
PHYS_AT_TRANS_NAME                AT_ENERGY_BAND               Atomic (molecular) Energy Band
PHYS_AT_TRANS_ENERGY_DISCREPANCY  AT_ENERGY_DIFF               Energy difference between experimental and calculated quantities
PHYS_AT_TRANS_ENERGY              AT_ENERGY_EXCIT              Excitation Energy
PHYS_AT_STATE_ENERGY_IONIZATION   AT_ENERGY_IONIZ              Ionization Energy or Potential
PHYS_AT_STATE_ENERGY(LEVEL)       AT_ENERGY_LEVEL              Energy Level
PHYS_AT_ENERGY_FORM               AT_ENERGY_FORMATION          Formation energy (or heat for molecules)
PHYS_AT_ENERG_POT                 AT_ENERGY_POTENTIAL          Atomic Energy or Potential
PHYS_AT_STATE_ENERGY_ROT          AT_ENERGY_ROTATION           Rotation Energy
PHYS_AT_STATE_ENERGY_TOT          AT_ENERGY_TOTAL              Total atomic energy
PHYS_AT_TRANS_FREQ                AT_FREQUENCY                   Transition Frequency
PHYS_AT_TRANS_FREQ_REST           AT_FREQUENCY_NU              Transition Frequency at rest
PHYS_AT_TRANS_FREQ_ROT            AT_FREQUENCY_ROTAT           Rotation Frequency
PHYS_AT_FS_                       AT_FS                          Fine Structure Quantities
PHYS_AT_FS_COLLSTR                AT_FS_COLL-STR               Fine Structure Collision Strength
PHYS_AT_FS_CONST?                 AT_FS_CONSTANT               Fine Structure Constant
PHYS_AT_TRANS_FS_WIDTH            AT_FS_CONTRIB                Fine Structure Contribution to Line Profile
PHYS_AT_TRANS_FS_SPLIT            AT_FS_SPLIT                  Fine Structure Splitting
PHYS_AT_TRANS_GA                  AT_GA                          Atomic ga value
PHYS_AT_LINE_INTENSITY            AT_INTENSITY                   Line Intensity
PHYS_AT_ION_                      AT_ION                         Ions
PHYS_AT_ION_ID                    AT_ION_ID                    Ion Identification
PHYS_AT_ION_STAGE                 AT_ION_STAGE                 Ionization Stage
PHYS_AT_LANDEFACT                 AT_LANDE-FACT                  Lande Factor (gf)
PHYS_AT_LEVEL                     AT_LEVEL                       Level Identification
PHYS_AT_STATE_LIFE                AT_LIFETIME                    Radiative Lifetime
PHYS_AT_LINE_                     AT_LINE                        Atomic or Molecular Lines
# What is the difference between LINE and TRANS?
PHYS_AT_LINE_EMISSIVITY           AT_LINE_EMISSIVITY           Line Emissivity
PHYS_AT_LINE_FLOURYIELD           AT_LINE_FLUOR-YIELD          Line Fluorescence Yield
PHYS_AT_LINE_ID                   AT_LINE_ID                   Line Identification
PHYS_AT_LINE_STRENGTH             AT_LINE_STRENGTH             Line Strength
PHYS_AT_LINE_MAIN-TERM?           AT_MAIN-TERM                   Main Term
PHYS_AT_MOL_                      AT_MOL                         Quantities Related to Molecules
PHYS_AT_MOL_DIELFN                AT_MOL_DIEL-FN               Molecular Dielectric Function
PHYS_AT_MOL_EDISSOC               AT_MOL_DISS-ENRGY            Molecular Dissociation Energy
PHYS_AT_MOL_ID                    AT_MOL_ID                    Molecule Identification
PHYS_AT_TRANS_MOL_LEVEL           AT_MOL_LEVEL                 Molecule Transition Level
PHYS_AT_MULTIPLET_                AT_MULTIPLET                   Quantities Related to Multiplets
PHYS_AT_MULTIPLET_ID              AT_MULTIPLET_ID              Multiplet Identification
PHYS_AT_MULTIPLET_N               AT_MULTIPLET_N               Multiplet Number element
PHYS_AT_Z                         AT_NUMBER                      Atomic Number
PHYS_AT_OSC_                      AT_OSC                         Oscillator Related Quantities
PHYS_AT_OSC?                      AT_OSC_STRENGTH              Oscillator Strength
PHYS_AT_PARITY                    AT_PARITY                      Atomic Parity
PHYS_AT_Q_                        AT_Q-N                         Atomic Structure, Quantum Numbers
PHYS_AT_Q_L                       AT_Q-N_ANG-MOM               Angular Momentum Quantum Number
PHYS_AT_Q_K                       AT_Q-N_K                     K quantum number
PHYS_AT_Q_UNK                     AT_Q-N_MISC                  Atomic Structure Quantum Number
PHYS_AT_Q_ORB                     AT_Q-N_ORBITAL               Orbital Quantum Number
PHYS_AT_Q_PRIN                    AT_Q-N_PRINCIPAL             Principal Quantum Number
PHYS_AT_Q_PRIN1                   AT_Q-N_PRINCIPAL_FIRST     First Principal Quantum Number
PHYS_AT_Q_PRIN2                   AT_Q-N_PRINCIPAL_SECOND    Second Principal Quantum Number
PHYS_AT_Q_ROT                     AT_Q-N_ROTATIONAL            Rotational Quantum Number
PHYS_AT_Q_TOR                     AT_Q-N_TORSIONAL             Torsional Quantum Number
PHYS_AT_Q_VIB                     AT_Q-N_VIBRATIONAL           Vibrational Quantum Number
PHYS_AT_REACTION                  AT_REACTION                    Atomic Reaction
PHYS_AT_SHELL                     AT_SHELL-NUMBER                Shell Quantum Numbers
PHYS_AT_SPECIES_LIST              AT_SPECIES                     Atomic Species Participating in a Reaction
PHYS_AT_TRANS_STARK_              AT_STARK                       Stark Effect
PHYS_AT_TRANS_STARK_BROAD         AT_STARK_BROAD               Broadening due to Stark Effect
PHYS_AT_TRANS_STARK_INT           AT_STARK_INTENSITY           Intensity due to Stark Effect
PHYS_AT_TRANS_SWEIGHT             AT_STAT-WEIGHT                 Statistical Weight
PHYS_AT_TRANS_WIDTH?              AT_STRENGTH-PARAM              Strength Parameter or Expect Width
PHYS_AT_TRANS                     AT_TRANS                       Quantities Related to Transitions
PHYS_AT_TRANS_BRANCH              AT_TRANS_BRNCH-RATIO         Transition Branching Ratio
PHYS_AT_TRANS_ENERGY              AT_TRANS_ENERGY              Transition Energy (or wave number)
PHYS_AT_TRANS_ID                  AT_TRANS_ID                  Transition Identification
PHYS_AT_TRANS_LEVELS              AT_TRANS_LEVELS              Transition Level

PHYS_AT_TRANS_PROB                AT_TRANS_PROB                Transition Probability
PHYS_AT_TRANS_STRENGTH            AT_TRANS_STRENGTH            Transition Strength
PHYS_AT_TRANS_TYPE                AT_TRANS_TYPE                Transition Type
PHYS_AT_TRANS_RECOMB              AT_TRANS_RECOMBIN            Recombination coefficients in atomic transitions
PHYS_AT_TRANS_LAMBDA              AT_WAVELENGTH                  Laboratory or Theoretical Line Wavelength
PHYS_AT_WEIGHT                    AT_WEIGHT                      Atomic Weight
OBJ_CLASS+                        CLASS                            Various Classification Descriptors
OBJ_CLASS_CODE                    CLASS_CODE                     Classification Code
OBJ_CLASS_COLOR                   CLASS_COLOR                    Color Classification
OBJ_CLASS_STAR_MK_TYPE
OBJ_CLASS_CLG_DIST                CLASS_DISTANCE                 Abell Distance Class
OBJ_CLASS                         CLASS_MISC                     Various Classification Descriptors
OBJ_CLASS                         CLASS_OBJECT                   Object Type Classification
OBJ_CLASS_CLG_RIC                 CLASS_RICHNESS                 Abell Richness Class
OBJ_CLASS_UNK_GAL                 CLASS_STAR/GALAXY              Star galaxy discriminator or classification.
OBJ_CLASS_UNK_BM                  CLASS_STRUCT                   Structure Classification (e.g. cluster Bautz-Morgan classification)
_CODE                             CODE                             Codes or Flags
_ERROR_CODE                       CODE_ERROR                     Flag denoting uncertainty about a given quantity
_FLAG_LIMIT                       CODE_LIMIT                     Lower or Upper limit Flag
_FLAG_MEMB                        CODE_MEMB                      Membership Code
_CODE                             CODE_MISC                      Miscellaneous Codes or Flags
OBJ_CLASS_MULT                    CODE_MULT                      Codes related to Multiplicity (particularly stars)
OBJ_CLASS_MULT                    CODE_MULT_FLAG               A code or flag indicating a multiplicity of binarity
OBJ_CLASS_MULT_N                  CODE_MULT_FREQUENCY          Multiplicity Frequency Code
OBJ_CLASS_MULT_N                  CODE_MULT_INDEX              Multiplicity Index Code
_QUAL                             CODE_QUALITY                   Quality Code
OBJ_CLASS_VAR                     CODE_VARIAB                    Variability Code or Flag
DATA_                             DATA                             Quantities Related to the Data
_SCALE_EXP                        DATA_FACTOR-EXP                Scale Factor Exponent (Base 10)
DATA_LINK                         DATA_LINK                      Link to additional data (in VizieR or any other database)
_MAX                              DATA_MAXIMUM                   Maximum data value found in a database column
_SCALE                            DATA_SCALE-FACTOR              Factor to Convert a Data Column to a normal value
_DATATYPE                         DATA_TYPE                      Data Type
DYN_                              DYN                              Dynamic Data Quantities (mixed column content)
DYN_QUANTITY                      DYN_QUANTITY                   Used when a Column means more than one thing.
DYN_VALUE                         DYN_VALUE                      Identification of a Dynamic Value
_ERROR                            ERROR                            Error or Uncertainty in Measurements
POS(,EQ)_RA_ERROR                 ERROR  # I/176
POS(,EQ)_DEC_ERROR                ERROR  # I/176
PHOT_FLUX(5 GHz)_ERROR            ERROR  # VIII/14
SRC_REG                           EXTENSION                        Quantities used to describe the extension in the sky of objects
SRC_REG_AREA                      EXTENSION_AREA                 Angular Area Covered by an Object
SRC_REG_DIA_DEC                   EXTENSION_DEC                  Angular Extension in Declination
SRC_REG_DIA                       EXTENSION_DIAM                 Angular Diameter or Size of the Major Axis
SRC_REG_DIA_FWHM                  EXTENSION_FWHM                 Angular Full Width at Half Maximum (FWHM)
SRC_REG_DIA_FWHM                  EXTENSION_FWHM_CIRC          Angular Full Width at Half Maximum (FWHM)
SRC_REG_DIA_MAJ_AXIS_FWHM         EXTENSION_FWHM_MAJ           Angular FWHM along the Major Axis
SRC_REG_DIA_MIN_AXIS_FWHM         EXTENSION_FWHM_MIN           Angular FWHM along the Minor Axis
SRC_REG_DIA_MIN_AXIS_FWHI         EXTENSION_HALFINT            Angular Size at Half Intensity along the Minor Axis
SRC_REG_DIA_MIN_AXIS              EXTENSION_MIN                  Angular Diameter of an object along the Minor Axis
SRC_REG_DIA_BEAMS                 EXTENSION_NORM                 Angular diameter normalized to beam size
SRC_REG_DIA_RA                    EXTENSION_RA                   Angular extension in right ascension
SRC_REG_RADIUS                    EXTENSION_RAD                  Angular radius of an object or Semi-major axis
SRC_REG_RADIUS_SCALELENGTH        EXTENSION_SC-LENGTH            Angular Scale Length (bulge or disk)
SRC_REG_RADIUS_MIN_AXIS           EXTENSION_SMIN                 Angular size of Semi-Minor Axis
_FIT                              FIT                              Fits of Models to Observational Data
_FIT_ERR                          FIT_ERROR                      Fit Error
_FIT_GOODNESS                     FIT_GOODNESS                   Fit Goodness
_FIT_ID                           FIT_ID                         Identification of the fit or solution
POP_LF                            FIT_LF                         Luminosity function
POP_LF_FIT_PARAMS                 FIT_LF                         Fit of Luminosity Function
POP_LF_FIT                        FIT_LF_GENERAL               Fit of Luminosity Function
POP_LF_FIT_MAG?                   FIT_LF_MAG                   Magnitudes related to the LF
POP_LF_FIT_MAG_MAX                FIT_LF_MAG_MAX             Magnitude interval upper limit
POP_LF_FIT_MAG_MIN                FIT_LF_MAG_MIN             Magnitude interval lower limit
_FIT_RATIO                        FIT_MEAS/THEOR                 Ratio of Measurement to Theoretical Value
_FIT_PAR                          FIT_PARAM                      Fit Parameter
_FIT_PAR_ID                       FIT_PARAM_ID                 Fit Parameter Identification
_FIT_MISC                         FIT_PARAM_MISC               Miscellaneous fit parameters
POS(,EQ)_RA_STAT_SIGMA            FIT_PARAM_MISC
# In I/176 S0RA, FIT_PARAM_MISC is the sigma-0 (?) for the RA
_FIT_COVAR                        FIT_PARAM_COVAR              Covariance of the fitting parameter
_FIT_RESID                        FIT_RESIDUAL                   Fit Residual
_FIT_CHI2                         FIT_CHI2                       Chi-square Fit Measurement
_FIT_SIGMA                        FIT_STDEV                      Fit's Standard Deviation
_FIT_TYPE                         FIT_TYPE                       Fit or Solution Type
POS(,EQ)_FIT_TYPE                 FIT_TYPE    I/176
_ZERO                             FIT_ZP                         Fit Zero Point (mostly in linear fits)
PHOT_COL_INDEX_DIFF               FIT_ZP
# In III/218 DIFF, FIT_ZP is the scatter in mag of the spectroscopic index
POS(,EQ)_DEC_STAT_SIGMA           FIT_ZP
# In I/176 S0DE, FIT_ZP is the sigma-0 (?) in arcseconds? for the Dec
-                                 ID                               Fields Used as Identifiers
OBJ_ID_ALT                        ID_ALTERNATIVE                 Alternative identification
OBJ_ID_FIELD                      ID_AREA                        Area Identification (usually in a photographic plate)
SRC_ID_XID                        ID_ASSOCIATED                  Identification of Associated Object (counterpart)
SRC_ID_AUTHOR                     ID_AUTHOR                      Author Name
SRC_ID_CAND                       ID_CANDIDATE                   Candidate Identification
SRC_ID_CAT                        ID_CATALOG                     Catalog Identification
SRC_ID_FCHART                     ID_CHART                       Finding Chart Identification
SRC_ID_COMP                       ID_COMPARISON                  Name of a Comparison Object
SRC_ID_CONSTEL                    ID_CONSTEL                     Constellation Name
SRC_ID_XID                        ID_CROSSID                     Cross Identification (counterpart)
OBS_DB_ID                         ID_DATABASE                    Database Identification
OBS_DS_ID                         ID_DATASET                     Data-Set Identification
OBS_EXP_ID                        ID_EXPOSURE                    Exposure Identification
INST_FIBER                        ID_FIBER                       Fiber Optics Identification (for M.O.S.)
OBS_FIELD                         ID_FIELD                       Field Identification
SRC_NOTES_FIG                     ID_FIGURE                      Figure Identification Number
SRC_NOTES_FILE                    ID_FILE                        File Identification
SRC_NOTES_FRAME                   ID_FRAME                       Frame Identification
?                                 ID_GROUP                       Group Identification
OBS_AUTHOR_CODE                   ID_HUMAN                       Identification of Discoverer or Observer
SRC_DISCOVERER_CODE               ID_HUMAN
SRC_ID_INTERNAL                   ID_IDENTIFIER                  Identification of a source or object, incomplete or for internal use.
OBS_IMAGE_ID                      ID_IMAGE                       Image Identification
SRC_ID   (or OBJ_ID?)             ID_MAIN                        Main Identifier of a Celestial Object
SRC_ID:1                          ID_MAIN:1                      First component of an identification field.
SRC_ID:2                          ID_MAIN:2                      Second component of an identification field.
SRC_ID:3                          ID_MAIN:3                      Third component of an identification field.
?                                 ID_MAP                         Map Identification
SRC_CAT_ID                        ID_NUMBER                      Numeric Identification (usually sequential)
?                                 ID_PARAM                       Identification or name of a parameter, or the name of a column in a table
SRC_PARENT                        ID_PARENT                      Parent Identification (galaxy, cluster, nebulae)
OBS_PLATE                         ID_PLATE                       Plate Identification
OBS_REGION_ID                     ID_REGION                      Region Identification (not necessarily sky region)
OBS_SET_ID                        ID_SET                         Set or Subset Identification, also bin or sample number
OBS_SITE_ID                       ID_SITE                        Site/Location/Observatory/City/Country identifier
INST_APER_ID                      ID_SLIT                        Slit Identification (usually in the context of M.O.S.)
# Hmm MOS have many apertures, 1 disperser?
SRC_ID_SURVEY                     ID_SURVEY                      Survey Identification
SRC_ID_TABLE                      ID_TABLE                       Table Identification
SRC_ID_TARGET?                    ID_TARGET                      Target Identifier
OBJ_CLASS_VAR?                    ID_VARIAB                      Variable Object Identification
DATA_PROC_SYS_VER                 ID_VERSION                     Identification of the software version.
?                                 ID_VOLUME                      Volume Identification
?                                 ID_ZONE                        Durchmusterung zone identification/sign
INST_                             INST                             Instrumental Quantities
-                                 INST_ANG                       Angular Properties of the Instruments/Telescopes
SRC_OFFAX                         INST_ANG_OFFAXIS             Off-axis angle respect to main direction of observation
# Presumably the instrument coords of a source, not a prop of the instru
OBS_SITE_ORBIT_PHASEANG           INST_ANG_PHASE               Satellite phase angle
INST_RESP_SPATIAL_RES             INST_ANG_RESOL               Angular resolution of instrument
OBS_SITE_ORBIT_ANGVEL             INST_ANG_VEL                 Satellite angular velocity
INST_DET_NOISE_TANT               INST_ANTENNA-TEMP              Antenna temperature
INST_GEOM_DIA                     INST_APERT                     Instrument/telescope aperture
INST_GEOM_AREA                    INST_AREA                      Collecting area or detector area
PHOT_BKG_INST                     INST_BACKGROUND                Background contribution
INST_COV_BAND                     INST_BAND                      Instrumental Band quantities
INST_CAL_BAND_DRIFT               INST_BAND_DRIFT              Band's drift rate
INST_COV_BAND_TRANS?              INST_BAND_PASS               Bandpass
INST_COV_BAND_WIDTH               INST_BANDWIDTH                 Spectral window used for the observation
INST_INT_BASELINE                 INST_BASELINE                  Baseline (interferometry)
INST_RESP_SPATIAL                 INST_BEAM                      Beam properties
?                                 INST_BEAM_MISC               Miscellaneous beam properties
INST_RESP_SPATIAL_RES             INST_BEAM_SIZE               Beam width or size
INST_DET_NOISE_TBEAM              INST_BEAM_TEMP               Beam temperature
INST_PHOT_CAL                     INST_CALIB                     Instrument calibration quantities
INST_PHOT_CAL_ERR                 INST_CALIB_ERROR             Instrument calibration error
?                                 INST_CALIB_MISC              Miscellaneous instrument calibration quantities
?                                 INST_CALIB_PARAM             Calibration parameter
?                                 INST_CORR-FACTOR               Correction (no only correction factor)
INST_DET                          INST_DET                       Detector parameters
INST_PHOT_FLUX_LIMIT              INST_DET_LIMIT               Detector limit
UNK                               INST_DET_MISC                Miscellaneous quantities related to the detector (plate or CCD)
INST_GEOM_SIZE                    INST_DET_SIZE                Detector size
# number of pixels, vs DET_SIZE with mm size
INST_DISP_SCALE                   INST_DISPERSION                Dispersion scale in a spectrograph
INST_QE                           INST_EFFICIENCY                Instrument efficiency
PHOT_ERR_INST                     INST_ERROR                     Errors associated to the instrument
INST_FILTER                       INST_FILTER                    Filter characteristics
INST_FILTER                       INST_FILTER_CODE             Filter characteristics type/code
INST_COV_BAND_FWHM                INST_FILTER_FWHM             FWHM of the used filter (also bandpass)
INST_COV_BAND_TRANS               INST_FILTER_TRANSM           Transmission characteristics of the filter (response)
INST_NAME                         INST_ID                        Instrument/Detector Identification
INST_LINE_WIDTH                   INST_LINE-WIDTH                Instrumental Line-Width
INST_DET_NOISE                    INST_NOISE                     Detector/Instrument noise level rms
INST_PARAM?                       INST_PARAM                     Various Instrumental Parameters
INST_GEOM_PIX_SIZE                INST_PIXSIZE                   Pixel Size
# distinguish pix size in mm and arcsec
INST_DET_PLATE                    INST_PLATE                     Quantities related to Photographic Plates
INST_DET_SIZE                     INST_PLATE_DIMENSION         Size or plate dimension
# Is the fact that it's a plate relevant? could be any detector
SRC_OFFSET_PIX                    INST_PLATE_DIST              Distance measurement on a plate
# ? distance between two sources in pixels?
INST_DET_PLATE_EMULSION           INST_PLATE_EMULSION          Plate Emulsion Type
# Now we care about it being a plate, only plates have emulsion
SRC_REG_DIA_PIX                   INST_PLATE_EXTENSION         Extension of an object in a plate (in plate units)
INST_DET_POS                      INST_POS                       Position on a detector or M.O.S template
INST_PHOT_PRECISION               INST_PRECISION                 Instrumental Precision
# Presumably photometric?
INST_RESP_SPATIAL                 INST_PSF                       Detector's Point Spread Function (PSF)
INST_DET_QE                       INST_QE                        Detector's Quantum Efficiency
SRC_DET_SN                        INST_S/N                       Instrumental signal to noise ratio (S/N)
# What does this mean? The S/N for a particular source?
INST_RESP_TIME_RES                INST_SAMP-TIME                 Instrumental Sampling Time
INST_GEOM_SCALE                   INST_SCALE                     Instrumental Scale (ccd or plate)
#  In arcsec/mm? otherwise pixel size
INST_RESP_SPATIAL_RES             INST_SEEING                    Seeing or fwhm of PSF
INST_PHOT_FLUX_LIMIT              INST_SENSITIVITY               Detector's Sensitivity (Flux limit)
INST_SETUP                        INST_SETUP                     Instrument configuration or set-up
-                                 INST_SKY                       Instrumental Sky Properties
PHOT_COUNTS_SKY?                  INST_SKY_LEVEL               Local Sky Level
PHOT_TEMP_SKY                     INST_SKY_TEMP                Sky Temperature
PHOT_TEMP_SIGMA_SKY               INST_SKY_SIGMA               Sigma of sky value distribution
-                                 INST_SPECT                     Spectroscopic instruments' quantities
INST_COV_BAND_LAMBDA_RANGE        INST_SPECT_BAND              Spectroscopic observation band
INST_DISP_TYPE_CODE               INST_SPECT_CODE              Spectroscopic instrument specification (prism, grism, grating)
INST_DISP_ORDER                   INST_SPECT_ORDER             Spectral Order
INST_DISP_SLIT_DX                 INST_SPECT_SLIT-LENGTH       Slit Length
INST_DISP_SLIT_DY                 INST_SPECT_SLIT-WIDTH        Slit Width
-                                 INST_TEMP                      Instrument Temperature (radio regime)
INST_DET_NOISE_TBEAM              INST_TEMP_BEAM               Beam Temperature or Brightness
# TEMP_BEAM is a way of describing the instrument noise
INST_DET_TSYS                     INST_TEMP_SYST               System Temperature
INST_DET_TRIGGER?                 INST_TRIGGER                   Detector's triggering Threshold
INST_TYPE                         INST_TYPE                      Instrument Type
INST_COV_BAND_VEL?                INST_VELOC                     Velocity Quantities at the Instrumental Level
INST_COV_BAND_VEL0                INST_VELOC_CENTRAL           Instrumental Central Velocity
INST_COV_BAND_VEL_RES             INST_VELOC_SPACING           Instrumental Velocity Channel Spacing
INST_COV_BAND_VEL_RANGE           INST_VELOC_WINDOW            Detector's Velocity Range
OBS_COV_BAND_LAMBDA               INST_WAVELENGTH                Observation's Wavelength properties
# We should distinguish between the wavelength coverage designed into an instrument
# and the wavelength coverage of a specific observation, I think the latter is meant here.
OBS_COV_BAND_LAMBDA_RANGE         INST_WAVELENGTH_COVERAGE     Instrument's Wavelength Range
OBS_COV_BAND_LAMBDA_EFF           INST_WAVELENGTH_EFFECTIVE     Observation's Effective Wavelength
OBS_COV_BAND_LAMBDA               INST_WAVELENGTH_VALUE        Wavelength related to an instrument, filter, etc.
MUTUAL_OCCULT(*OBJ)               -    
MUTUAL_OCCULT(L)                  LUNAR-OCCULT                     Lunar Occultaion related quantities
# Occultations of anything could have the same parameters. So let's specify that
# it's lunar by an argument L, and generalize eg
#  MUTUAL_OCCULT(PLUTO)_ANG
MUTUAL_OCCULT(L)_ANG              LUNAR-OCCULT_ANGLE             Lunar Occultation Contact Angle
MUTUAL_OCCULT(L)_FRAC             LUNAR-OCCULT_FRACTION          Percentage of the moon illuminated during the time of occultation
MUTUAL_OCCULT(L)_LIMBSLOPE        LUNAR-OCCULT_LIMB-SLOPE        Lunar Occultation Limb Slope
_MODEL                            MODEL                            Quantities generated by Models
SPEC_CONT_FLUX                    MODEL_CONTINUUM                Continuum level
_CORR                             MODEL_CORRECTION               Correction or adjustment
OBJ_VEL_DRIFT                     MODEL_DRIFT-VELOC              Terminal drift velocity
OBJ_GEOM_TRIAX                    MODEL_DYN-TRIAX                Dynamical triaxiality
?                                 MODEL_ENERGY                   Energy modeled quantities
SPEC_SED_MODEL                    MODEL_ENERGY_DIST            Energy distribution
PHYS_BULK_EOS                     MODEL_EOS                      Equation of state
PHYS_BULK_EOS_ID                  MODEL_EOS_ID                 Name of used equation of state
LOS_ISM_EXT                       MODEL_EXTINCTION               Interstellar extinction quantities
LOS_ISM_EXT_COEFF                 MODEL_EXTINCTION_COEFF       Insterstellar extinction coefficient
# Extinction coeffs and other theory are always 'model'.
_MODEL_FEATURE                    MODEL_FEATURE                  Model Feature
PHOT_FLUX_MODEL                   MODEL_FLUX                     Modeled Flux
_MODEL_ID                         MODEL_ID                       Model Identification
SPEC_LINE_FLUX_MODEL              MODEL_LINE-FLUX                Model Spectral Line Flux
PHOT_MAG_MODEL                    MODEL_MAG                      Model-generated Magnitude
_MODEL_DIFF                       MODEL_MAG_CORR               Magnitude Correction or Difference
_MODEL                            MODEL_MAG_VALUE              Magnitude (in any band) generated by a model (or templates)
?                                 MODEL_MOMENT-FLUX-RATIO        Moment Flux Ratio
_MODEL_PARAM                      MODEL_PARAM                    Model Parameter
POP_SPEC_SYNTH                    MODEL_POP-SYNTHESIS            Population Synthesis Quantity
_MODEL_RESIDUAL                   MODEL_RESIDUAL                 Model Residual
_MODEL_RESULT                     MODEL_RESULT                   Model Solution Value
_MODEL_TYPE                       MODEL_TYPE                     Model Type
PHYS_AT_TRANS_ZEEMAN              MODEL_ZEEMAN                   Zeeman Effect Quantities
PHYS_AT_TRANS_ZEEMAN_CO           MODEL_ZEEMAN_COEFF           Zeeman Effect Coefficient
OBJ_CLASS_MORPH?                  MORPH                            Morphology of celestial objects
OBJ_CLASS_GAL_ARMS                MORPH_ARMS                     Spiral Arms Structure (galaxies)
OBJ_CLASS_GAL_ARMS_RATIO          MORPH_ARMS_RATIO             Ratio of Spiral Arm (galaxies)
OBJ_CLASS_GAL_ARMS_WOUND          MORPH_ARMS_WOUND             Wound Parameter of a spiral arm galaxy
OBJ_CLASS_GAL_ASYM                MORPH_ASYMMETRY                Asymmetry Induced by Rotation
OBJ_CLASS_GAL_BAR                 MORPH_BAR                      Presence or detection of a bar in a galaxy
OBJ_CLASS_MORPH_CODE              MORPH_CODE                     Code refering to a morphological property
OBJ_CLASS_MORPH_PARAM             MORPH_PARAM                    Morphological (geometrical) parameter
OBJ_CLASS_MORPH_TYPE              MORPH_TYPE                     Morphological Type
_NOTE                             NOTE                             A Note related to a certain quantity or value
_N                                NUMBER                           Number Of ``things'' (stars, observations, etc.)
OBJ(*OBJ)                         -                               Specific object
OBJ(E)_NUT                        NUTATION                         Earth's Nutation Related Quantities
OBJ(E)_NUT_ANGLE                  NUTATION_PARAM                 Nutation Parameter
# I'm guessing this is the angle
_OBS ?                            OBS                              Observational Quantities
SRC_REG_DIA                       OBS_ANG-SIZE                   Observational angular size
OBS_INST_BAND                     OBS_BAND                       Band or Filter used for the observation
PHOT_CAL                          OBS_CALIB                      Calibrations related to observations
PHOT_CAL_ZERO                     OBS_CALIB_CONST              Calibration's Constant
PHOT_CAL_SCALE                    OBS_CALIB_FACTOR             Calibration conversion factor
# This is heterogeneous...I'm guessing flux cal is meant here, but
# need ones for wave cal too etc
OBS_ID                            OBS_CODE                       Observation code for observing run
OBS_SITE_CONDS                    OBS_CONDITIONS                 Observation condition
PHOT_LIMIT                        OBS_DETECT-LIMIT               Detection Limit
# This is a property of a region of an observation - you may have an upper limit
# at a point or a single detection limit for a whole field, it's the same thing
# (so note there is an association between limit and region)
# It may have suffix of bandpass
SRC_DET_SIG                       OBS_DETECT-SIGNIF              Detection Significance
# This is a property of a detected source
_DIFF                             OBS_DIFF                       Observations' offset, difference, or deviation
# Append to UCD of whatever is offset
OBS_POS_UNC_DRIFT                 OBS_DRIFT                      Positional drift during the observation
OBS_COV_BAND_FREQ                OBS_FREQUENCY                  Frequency of the observation
OBS_ID                            OBS_ID                         Observation identification
#  Comment: OBS_ mixes observation conditions and observed quantities.
SPEC_LINE_WIDTH_G                 OBS_LW                         Observed gaussian line-width
OBS_METHOD                        OBS_METHOD                     Observational Method/Technique
UNK                               OBS_OTHER                      Other Measurements
#  Comment: useless?
OBS_PARAM ?                       OBS_PARAM                      Additional Observational Parameters
OBS_PLATE ?                       OBS_PLATE                      Quantities related to measurements on plates
SRC_REG_DIA?                      OBS_PLATE_APERT              Plate (Circular) Aperture
SRC_REG_DIA                       OBS_PLATE_EXTENSION          Linear diameter of an object measured on a Plate
#  Comment: what does this really mean? Is this really different to a normal measured  diameter?
_MODEL_RATIO                      OBS_PRED/OBS                   Fraction of predicted to observed quantities
#  Comment: is this really different to FIT MEAS/THEORY?  Need to attach to whatever UCD is being measured. 
OBS_RUN                           OBS_RUN                        Observation run
SRC_REG_DIA                       OBS_SIZE                       Observed size
#  Comment: I doubt that OBS_SIZE and EXTENSION_DIAM are really different.
SRC_REG_DIA_DEC                   OBS_SIZE_DEC                 Observed size in declination
OBS_DISP                          OBS_SLIT                       Spectroscopic slit properties
# Applies to any dispersive system, not always a slit spectrograph?
SRC_DISP_Y                        OBS_SLIT_OFFSET              Slit offset respect to the nucleus of galaxy
#  Comment: this is really "position of source in slit coordinates".
OBS_DISP_THETA                    OBS_SLIT_ORIENT              Slit orientation
#  Comment: is this "PA of slit on sky" or "orientation of slit wrt source major axis"?
#  I suspect the former.
OBS_SPECTRUM?                     OBS_SPECTRUM                   Spectral observations
OBS_TYPE ?                        OBS_TYPE                       Type of observation
OBS_SITE                          OBSTY                            Data on Observatories
OBS_SITE_POS_ALT                  OBSTY_ALTITUDE                 Observatory Altitude
OBS_SITE_CODE                     OBSTY_CODE                     Observatory Code
OBS_SITE_NAME                     OBSTY_ID                       Observatory Identification/Name
ORBIT                             ORBIT                            Orbital elements (planets, double stars, galaxies)
ORBIT_ELT_NODE                    ORBIT_ASC-NODE                 Longitude of ascending node
ORBIT_COMET?                      ORBIT_COMETS                   Cometary orbit parameter
ORBIT_CONV_ANG?                   ORBIT_CONV-ANGLE               Convergence angle
ORBIT_PERI                        ORBIT_DISTANCE                 Distance, perihelion, or separation between components
ORBIT_DIST                        ORBIT_DISTANCE                 Distance, perihelion, or separation between components
# Here instantaneous distance
ORBIT_ELT_E                       ORBIT_ECCENTRICITY             Orbital eccentricity
ORBIT_ELONG                       ORBIT_ELONGATION               Elongation of radiant
ORBIT_FREQ                        ORBIT_FREQUENCY                Orbital frequency (orbital angular velocity)
ORBIT_ELT_M                       ORBIT_MEAN-ANOMALY             Mean anomaly
-                                 ORBIT_P-ASTRON                 Quantities related to the Periastron
ORBIT_ELT_AOP                     ORBIT_P-ASTRON_ARG           Periastron argument or longitude
ORBIT_ELT_TPERI                   ORBIT_P-ASTRON_DATE          Date of occurance of periastron
ORBIT_PERIDOT                     ORBIT_P-ASTRON_RATE          Rate of periastron advance
ORBIT_ELT_AOP                     ORBIT_P-HELION                 Perihelion argument or longitude
-                                 ORBIT_PARAM                    Orbital parameter
ORBIT_PERIOD                      ORBIT_PERIOD                   Orbital period
ORBIT_PDOT                        ORBIT_PERIOD_DERIVATIVE      Time derivative of orbital period
ORBIT_PHASEANG                    ORBIT_PHASE-ANGLE              Orbital phase angle
ORBIT_RV                          ORBIT_RV                       Orbital radial velocity properties
ORBIT_RV_AMP                      ORBIT_RV_S-AMPLITUDE         Semi amplitude of radial velocity curve
ORBIT_DIA_PROJ                    ORBIT_SEPARATION               Orbital Separation (angular distance)
ORBIT_DIA                         ORBIT_SIZE                     Orbital size
ORBIT_RADIUS                      ORBIT_SIZE_RADIUS            Orbital radius (binary stars)
ORBIT_ELT_A                       ORBIT_SIZE_SMAJ              Semi-major axis of the orbit
PHOT_                             PHOT                             Photometry, extending to several wavelength regimes (X to Radio)
PHOT_MAG_13C_                     PHOT_13C                       13 color system (Stellar Applications) GCPD#66
PHOT_COL(13C,33-52)               PHOT_13C_33-52               Color index 33-52 (13C)
PHOT_COL(13C,35-52)               PHOT_13C_35-52               Color index 35-52 (13C)
PHOT_COL(13C,37-52)               PHOT_13C_37-52               Color index 37-52 (13C)
PHOT_COL(13C,40-52)               PHOT_13C_40-52               Color index 40-52 (13C)
PHOT_COL(13C,45-52)               PHOT_13C_45-52               Color index 45-52 (13C)
PHOT_MAG(13C,52)                  PHOT_13C_52                  Magnitude 52 (13C)
PHOT_COL(13C,52-110)              PHOT_13C_52-110              Color index 52-110 (13C)
PHOT_COL(13C,52-58)               PHOT_13C_52-58               Color index 52-58 (13C)
PHOT_COL(13C,52-63)               PHOT_13C_52-63               Color index 52-63 (13C)
PHOT_COL(13C,52-72)               PHOT_13C_52-72               Color index 52-72 (13C)
PHOT_COL(13C,52-80)               PHOT_13C_52-80               Color index 52-80 (13C)
PHOT_COL(13C,52-86)               PHOT_13C_52-86               Color index 52-86 (13C)
PHOT_COL(13C,52-99)               PHOT_13C_52-99               Color index 52-99 (13C)
_ABS                              PHOT_ABS-MAG                   Absolute magnitude
_ABS                              PHOT_ABS-MAG_BAND            Absolute magnitude in a band, regardles of band
PHOT_MAG_BOL_ABS                  PHOT_ABS-MAG_BOL             Bolometric absolute magnitude
OBS_ATM_                          PHOT_ATM                       Earth Atmosphere Parameters Linked to Photometry
OBS_ATM_AIRMASS                   PHOT_ATM_AIRMASS             Air mass
OBS_ATM_EXT                       PHOT_ATM_EXT                 Atmospheric extinction coefficient
PHOT_BOL_                         PHOT_BOL                       Bolometric Quantities
PHOT_COL_BOL()                    PHOT_BOL_CORR                Bolometric correction
PHOT_FLUX_BOL                     PHOT_BOL_FLUX                Bolometric Flux
PHOT_LUM_BOL                      PHOT_BOL_LUMINOSITY          Bolometric luminosity
PHOT_MAG_BOL                      PHOT_BOL_MAG                 Bolometric magnitude
SRC_IMAGE_SLOPE                   PHOT_BRIGHTNESS-SLOPE          Spatial brightness distribution slope
# This is part of a spatial flux model for a source
#
PHOT_COL                          PHOT_CI                        Color index in unspecified system
PHOT_COL(,102-C220)               PHOT_CI_102-C220             Color index 102-C220
PHOT_COL(UNK,B-R)                 PHOT_CI_B-R                  Color index B-r
PHOT_COL(HALPHA,LINE-CONT)        PHOT_CI_ALPHA                Color index based on H-alpha line
PHOT_COL(HBETA,LINE-CONT)         PHOT_CI_BETA                 Color index beta or h-beta (not Stroemgren index)
PHOT_COL(BALMER,LINE-CONT)        PHOT_CI_BALMER               Color index using the Balmer lines Hgamma or higher
PHOT_COL(UNK,B-I)                 PHOT_CI_B-I                  Color index B-I from heterogeneous photometric systems
PHOT_COL(UNK,B-K)                 PHOT_CI_B-K                  Color index B-K from heterogeneous photometric systems
PHOT_COL(UNK,B-V)                 PHOT_CI_B-V                  Color index B-V in a non-conventional system
PHOT_COL(,CN-TiO)                 PHOT_CI_CN-TIO               Color index CN-TiO
PHOT_COL_CODE                     PHOT_CI_CODE                 Codes associated with color index
PHOT_COL_FRACT                    PHOT_CI_FRACT                Fractional color index
PHOT_COL(g,b-v)                   PHOT_CI_GB-GV                Color index gb-gv
PHOT_COL(g,u-b)                   PHOT_CI_GU-GB                Color index gu-gb
PHOT_COL(IRAS,)                   PHOT_CI_IR                   Various far IR color indices (e.g. with IRAS bands)
PHOT_COL(,IR-OPT)                 PHOT_CI_IR-OPT               Color index Infrared minus optical
PHOT_COL(,M-51)                   PHOT_CI_M-51                 Color index M-51
PHOT_COL(,R-HALPHA)               PHOT_CI_R-HALPHA             Color index R minus Halpha
PHOT_COL(,R-I)                    PHOT_CI_R-I                  Color index R-I
PHOT_COL(,U-B)                    PHOT_CI_U-B                  Color index u-B U-B
PHOT_COL(,U-R)                    PHOT_CI_U-R                  Color index u-r
PHOT_COL(UNK,UNK)                 PHOT_CI_UNDEF                Color index in unspecified system
PHOT_COL(,UV-OPT)                 PHOT_CI_UV-OPT               Color index uv minus Optical (UV-OPT)
PHOT_COL(,V-I)                    PHOT_CI_V-I                  Color index V-I (no standard system specified)
PHOT_COL(,V-R)                    PHOT_CI_V-R                  Color index V-R (no standard system specified)
?                                 PHOT_CLASS                     Classification of photometry
PHOT_COL_                         PHOT_COLOR                     Quantities related to color indices
PHOT_COL_EXCESS                   PHOT_COLOR_EXCESS            Color excess (not just E(B-V))
PHOT_RATE                         PHOT_COUNT-RATE                Count rates in several wavelength regimes
PHOT_RATE(UV)                     PHOT_COUNT-RATE_UV           Count rate in ultraviolet
PHOT_RATE(XR)                     PHOT_COUNT-RATE_X            Count rate in x-ray
PHOT_COUNTS                       PHOT_COUNTS                    Count measured in the detector
PHOT_COUNTS(IUE/SWP)              PHOT_COUNTS_IUE              Count from IUE
PHOT_COUNTS(IUE/LWP)              PHOT_COUNTS_IUE              Count from IUE
PHOT_COUNTS                       PHOT_COUNTS_MISC             Count measurement in the detector
PHOT_COUNTS(RADIO)                PHOT_COUNTS_RADIO          Counts in radio regime
PHOT_COUNTS(GAMMA)                PHOT_COUNTS_GAMMA          Count in gamma-ray regime
PHOT_RATE(GAMMA)                  PHOT_COUNT-RATE_GAMMA      Count rate of gamma photons
PHOT_COUNT_RATIO                  PHOT_COUNTS_RATIO          Ratio of photon counts, or relative counts.
PHOT_COUNTS(XR)                   PHOT_COUNTS_X                Counts in X-ray
PHOT_MAG(COUS)                    PHOT_COUS                      Cousins photometric system GCPD#54
PHOT_MAG(COUS,I)                  PHOT_COUS_I                  Cousins magnitude Ic 
PHOT_MAG(COUS,R)                  PHOT_COUS_R                  Cousins magnitude R COUS
PHOT_COL(COUS,R-I)                PHOT_COUS_R-I                Cousins R-I color index COUS
PHOT_COL(COUS,V-I)                PHOT_COUS_V-I                (Kron-)Cousins V-I color index COUS
PHOT_COL(COUS,V-R)                PHOT_COUS_V-R                (Kron-)Cousins V-R color index
PHOT_MAG(DDO,)                    PHOT_DDO                       DDO Photometric System GCPD#12
PHOT_COL(DDO,35-38)               PHOT_DDO_35-38               Color index 35-38 DDO
PHOT_COL(DDO,38-41)               PHOT_DDO_38-41               Color index 38-41 DDO
PHOT_COL(DDO,41-42)               PHOT_DDO_41-42               Color index 41-42 DDO
PHOT_COL(DDO,42-45)               PHOT_DDO_42-45               Color index 42-45 DDO
PHOT_COL(DDO,42-48)               PHOT_DDO_42-48               Color index 42-48 DDO
PHOT_COL(DDO,45-48)               PHOT_DDO_45-48               Color index 45-48 DDO
PHOT_COL(DDO,48-51)               PHOT_DDO_48-51               Color index 48-51 DDO
PHOT_MAG(DDO,48)                  PHOT_DDO_M48                 Magnitude m48 DDO
-                                 PHOT_DIFF                      Differences or differential quantities
PHOT_COL()_DIFF                   PHOT_DIFF_CI                 Difference in color index
PHOT_MAG()_DIFF                   PHOT_DIFF_MAG                Difference in or differential magnitude
PHOT_SB()_DIFF                    PHOT_DIFF_SB                 Difference in surface brightness
SRC_DIST_MAG                      PHOT_DIST-MOD                  Distance Modulus
# Distance modulus is not a brightness, it's a distance expressed in mag
PHOT_EXT                 PHOT_EXTINCTION                Extinction total to differential
PHOT_EXT_GAL              PHOT_EXTINCTION_GAL          Galactic extinction
PHOT_EXT_INT               PHOT_EXTINCTION_INT          Internal extinction
PHOT_EXT_ISM                   PHOT_EXTINCTION_ISM          Interstellar Absorption
PHOT_EXT_R                   PHOT_EXTINCTION_R            Insterstellar extinction (ratio total to differential)
PHOT_EXT_TOT                   PHOT_EXTINCTION_TOTAL        Total Extinction
PHOT_FLUENCE             PHOT_FLUENCE                   Fluence
PHOT_FLUX                 PHOT_FLUX                      Flux
PHOT_FLUXD                   PHOT_FLUX_DENSITY            Flux density
PHOT_FLUX(GAMMA)                   PHOT_FLUX_GAMMA              Flux in gamma rays
PHOT_FLUX(HALPHA)                   PHOT_FLUX_HALPHA             H-Alpha Flux
PHOT_FLUX(HBETA)                   PHOT_FLUX_HBETA              H Beta line flux
PHOT_FLUX(IRAS)                   PHOT_FLUX_IR                 IR flux (IRAS or others)
PHOT_FLUX(6 mu)                     PHOT_FLUX_IR_6             Flux density around 6 microns (e.g. ISO at 6.7 microns) close to M filter
PHOT_FLUX(9 mu)                     PHOT_FLUX_IR_9             Flux density around 9 microns (range 8-10)
PHOT_FLUX(IRAS12)                     PHOT_FLUX_IR_12            Flux density (IRAS) at 12 microns, or around 12 microns (ISO at 14.3)
PHOT_FLUX(IRAS25)                     PHOT_FLUX_IR_25            Flux density (IRAS) at 25 microns
PHOT_FLUX(3.5 mu)                     PHOT_FLUX_IR_3.5           Flux density at 3.5 microns
PHOT_FLUX(15 mu)                     PHOT_FLUX_IR_15            Flux density around 15 microns (e.g. 14.3um ISO)
PHOT_FLUX(IRAS60)                     PHOT_FLUX_IR_60            Flux density (IRAS) at 60 microns
PHOT_FLUX(IRAS100)                     PHOT_FLUX_IR_100           Flux density (IRAS) at 100 microns
PHOT_FLUX(170 mu)                     PHOT_FLUX_IR_170           Far infra-red Flux density around 170um (1750GHz)
PHOT_FLUX(300 mu)                     PHOT_FLUX_IR_300           Far infra-red Flux density around 300um (3000GHz)
PHOT_FLUX(FIR)                     PHOT_FLUX_IR_FAR           Far Infrared flux
PHOT_FLUX(H)                     PHOT_FLUX_IR_H             Flux Density in Johnson's H Band
PHOT_FLUX(L)                     PHOT_FLUX_IR_L             Flux Density in Johnson's L Band
PHOT_FLUX(UNK)                     PHOT_FLUX_IR_MISC          Miscellaneous IR fluxes
PHOT_FLUX_RATIO                   PHOT_FLUX_NORM               Normalized Flux, always dimensionless
PHOT_FLUX(OPTICAL)                   PHOT_FLUX_OPTICAL            Flux in the Optical (unspecified system and/or units)
PHOT_FLUX(RADIO)                   PHOT_FLUX_RADIO              Flux density at radio frequencies
PHOT_FLUX(22 MHz)                     PHOT_FLUX_RADIO_22M        Radio flux density around 22MHz (13.6m)
PHOT_FLUX(31 MHz)                     PHOT_FLUX_RADIO_31M        Radio flux density around 31MHz (9.7m)
PHOT_FLUX(43 MHz)                     PHOT_FLUX_RADIO_43M        Radio flux density around 43MHz (7.0m)
PHOT_FLUX(61 MHz)                     PHOT_FLUX_RADIO_61M        Radio flux density around 61MHz (4.9m)
PHOT_FLUX(87 MHz)                     PHOT_FLUX_RADIO_87M        Radio flux density around 87MHz (3.5m)
PHOT_FLUX(110 MHz)                     PHOT_FLUX_RADIO_110M       Radio flux density around 110MHz (2.7m)
PHOT_FLUX(150 MHz)                     PHOT_FLUX_RADIO_150M       Radio flux density around 150MHz (2.0m)
PHOT_FLUX(175 MHz)                     PHOT_FLUX_RADIO_175M       Radio flux density around 175MHz (1.7m)
PHOT_FLUX(250 MHz)                     PHOT_FLUX_RADIO_250M       Radio flux density around 250MHz (1.2m)
PHOT_FLUX(325 MHz)                     PHOT_FLUX_RADIO_325M       Radio flux density around 325MHz (92cm)
PHOT_FLUX(365 MHz)                     PHOT_FLUX_RADIO_365M       Radio flux density around 365MHz (82cm)
PHOT_FLUX(400 MHz)                     PHOT_FLUX_RADIO_400M       Radio flux density around 400MHz (75cm)
PHOT_FLUX(500 MHz)                     PHOT_FLUX_RADIO_500M       Radio flux density around 500MHz (60cm)
PHOT_FLUX(600 MHz)                     PHOT_FLUX_RADIO_600M       Radio flux density around 600MHz (50cm)
PHOT_FLUX(700 MHz)                     PHOT_FLUX_RADIO_700M       Radio flux density around 700MHz (43cm)
PHOT_FLUX(850 MHz)                     PHOT_FLUX_RADIO_850M       Radio flux density around 850MHz (35cm)
PHOT_FLUX(1 GHz)                     PHOT_FLUX_RADIO_1G         Radio flux density around 1GHz (30cm)
PHOT_FLUX(1.4 GHz)                     PHOT_FLUX_RADIO_1.4G       Radio flux density around 1.4GHz (21cm)
PHOT_FLUX(1.6 GHz)                     PHOT_FLUX_RADIO_1.6G       Radio flux density around (OH maser)
PHOT_FLUX(2.0 GHz)                     PHOT_FLUX_RADIO_2G         Radio flux density around 2GHz (15cm)
PHOT_FLUX(2.7 GHz)                     PHOT_FLUX_RADIO_2.7G       Radio flux density around 2.7GHz (11cm)
PHOT_FLUX(3.9 GHz)                     PHOT_FLUX_RADIO_3.9G       Radio flux density around 3.9GHz (7.7cm)
PHOT_FLUX(5.0 GHz)                     PHOT_FLUX_RADIO_5G         Radio flux density around 5GHz (6cm)
PHOT_FLUX(7.5 GHz)                     PHOT_FLUX_RADIO_7.5G       Radio flux density around 7.5GHz (4cm)
PHOT_FLUX(8.4 GHz)                     PHOT_FLUX_RADIO_8.4G       Radio flux density around 8.4GHz (3.6cm)
PHOT_FLUX(10.7 GHz)                     PHOT_FLUX_RADIO_10.7G      Radio flux density around 10.7GHz (2.8cm)
PHOT_FLUX(15.0 GHz)                     PHOT_FLUX_RADIO_15G        Radio flux density around 15GHz (2cm)
PHOT_FLUX(22.0 GHz)                     PHOT_FLUX_RADIO_22G        Radio flux density around (H2O maser)
PHOT_FLUX(36.0 GHz)                     PHOT_FLUX_RADIO_36G        Radio flux density around 36GHz (8.3mm)
PHOT_FLUX(43.0 GHz)                     PHOT_FLUX_RADIO_43G        Radio flux density around 43GHz (7.0mm)
PHOT_FLUX(63.0 GHz)                     PHOT_FLUX_RADIO_63G        Radio flux density around 63GHz (4.8mm)
PHOT_FLUX(90.0 GHz)                     PHOT_FLUX_RADIO_90G        Radio flux density around 90GHz (3.3mm)
PHOT_FLUX(125.0 GHz)                     PHOT_FLUX_RADIO_125G       Radio flux density around 125GHz (2.4mm)
PHOT_FLUX(180.0 GHz)                     PHOT_FLUX_RADIO_180G       Radio flux density around 180GHz (1.7mm)
PHOT_FLUX(250.0 GHz)                     PHOT_FLUX_RADIO_250G       Radio flux density around 250GHz (1.2mm)
PHOT_FLUX(350.0 GHz)                     PHOT_FLUX_RADIO_350G       Radio flux density around 350GHz (860um)
PHOT_FLUX(500.0 GHz)                     PHOT_FLUX_RADIO_500G       Radio flux density around 500GHz (600um)
PHOT_FLUX(700.0 GHz)                     PHOT_FLUX_RADIO_700G       Radio flux density around 700GHz (430um)
PHOT_FLUX(RADIO)                    PHOT_FLUX_RADIO_MISC       Miscellaneous Radio flux density
PHOT_FLUX(SiO-Maser)                     PHOT_FLUX_RADIO_SIO-MASER   SiO maser peak radio flux
PHOT_FLUX_RATIO                   PHOT_FLUX_RATIO              Flux ratio
PHOT_FLUX_RATIO                   PHOT_FLUX_REL                Relative (normalized) flux
PHOT_FLUX(UV)                   PHOT_FLUX_UV                 Ultraviolet flux (uv far-uv euv)
PHOT_FLUX(X)                   PHOT_FLUX_X                  X-ray flux
PHOT_MAG(GEN,)                 PHOT_GEN                       Geneva's photometric system GCPD#13
PHOT_COL(GEN,B-V)                    PHOT_GEN_B-V                 Geneva color index B-V (GEN)
PHOT_COL(GEN,B1-B)                   PHOT_GEN_B1-B                Geneva color index B1-B (GEN)
PHOT_COL(GEN,B2-B)                   PHOT_GEN_B2-B                Geneva color index B2-B (GEN)
PHOT_COL(GEN,G-B)                    PHOT_GEN_G-B                 Geneva color index G-B (GEN)
PHOT_COL(GEN,)                       PHOT_GEN_MISC                various geneva photometric color indices (and linear combinations)
PHOT_COL(GEN,U-B)                    PHOT_GEN_U-B                 Geneva color index U-B (GEN)
PHOT_MAG(GEN,V)                      PHOT_GEN_V                   Geneva magnitude filter V (GEN)
PHOT_COL(GEN,V-B)                    PHOT_GEN_V-B                 Geneva color index V-B (GEN)
PHOT_COL(GEN,V1-B)                   PHOT_GEN_V1-B                Geneva color index V1-B (GEN)
PHOT_MAG(GUNN,)                      PHOT_GUNN                      Gunn Photometric System GCPD#38
PHOT_MAG(GUNN,G)                     PHOT_GUNN_G                  Magnitude g (GUNN)
PHOT_COL(GUNN,G-I)                   PHOT_GUNN_G-I                Color index g-i (GUNN)
PHOT_COL(GUNN,G-R)                   PHOT_GUNN_G-R                Color index g-r (GUNN)
PHOT_MAG(GUNN,I)                     PHOT_GUNN_I                  Magnitude i (GUNN), also used in DENIS (0.82{mu}m)
PHOT_COL(GUNN,I-Z)                   PHOT_GUNN_I-Z                Color index I-z (GUNN)
PHOT_MAG(GUNN,R)                     PHOT_GUNN_R                  Magnitude R (GUNN)
PHOT_COL(GUNN,R-I)                   PHOT_GUNN_R-I                Color index R-I (GUNN)
PHOT_MAG(GUNN,V)                     PHOT_GUNN_V                  Magnitude v (GUNN)
PHOT_COL(GUNN,V-R)                   PHOT_GUNN_V-R                Color index V-R (GUNN)
PHOT_MAG(GUNN,Z)                     PHOT_GUNN_Z                  Magnitude z (GUNN)
PHOT_MAG(HEI,)                       PHOT_HEI                       Heidelberg s Photometric System (HEI)
PHOT_COL(HEI,U-B)                    PHOT_HEI_U-B                 Heidelberg photometry U-B (HEI)
PHOT_MAG(HIP,)                       PHOT_HIPPAR                    Hipparcos' photometry system
PHOT_MAG(HST,)                       PHOT_HST                       HST Photometric System (by filter name) (HST)
PHOT_MAG(HST,F1042M)                 PHOT_HST_F1042M              Magnitude F1042M (HST)
PHOT_MAG(HST,F140W)                  PHOT_HST_F140W               Magnitude M104W (HST)
PHOT_COL(HST,IR-IR)                  PHOT_HST_CI_IR               HST Color Index from IR filters, e.g. F140W-F210W
PHOT_COL(HST,U-B)                    PHOT_HST_CI_U-B              HST Color Index close to U-B, e.g. F336W-F430W
PHOT_MAG(HST,F170W)                  PHOT_HST_F170W               Magnitude F170W (HST)
PHOT_MAG(HST,F175W)                  PHOT_HST_F175W               Magnitude F175W (HST)
PHOT_MAG(HST,F220W)                  PHOT_HST_F220W               Magnitude F220W (HST)
PHOT_MAG(HST,F255W)                  PHOT_HST_F255W               Magnitude F255W (HST)
PHOT_MAG(HST,F275W)                  PHOT_HST_F275W               Magnitude F275W (HST)
PHOT_MAG(HST,F300W)                  PHOT_HST_F300W               Ultraviolet Magnitude F300W (HST)
PHOT_COL(HST,U-V)                    PHOT_HST_CI_U-V              HST Color Index close to U-V, e.g. F336W-F555W
PHOT_MAG(HST,F342W)                  PHOT_HST_F342W               Ultraviolet Magnitude in filters F330W or F342W (HST)
PHOT_MAG(HST,F430W)                  PHOT_HST_F430W               Ultraviolet magnitude F430W or F439W (HST)
PHOT_COL(HST,B-V)                    PHOT_HST_CI_B-V              HST Color Index close to B-V, e.g. F430W-F555W
PHOT_MAG(HST,F450W)                  PHOT_HST_F450W               Ultraviolet Magnitude F450W (HST)
PHOT_MAG(HST,F480LP)                 PHOT_HST_F480LP              Magnitude F480LP (HST)
PHOT_MAG(HST,F547M)                  PHOT_HST_F547M               Magnitude F547M (HST)
PHOT_MAG(HST,F555W)                  PHOT_HST_F555W               Magnitude F555W (HST)
PHOT_COL(HST,B-R)                    PHOT_HST_CI_B-R              HST Color Index close to B-R, e.g. F430W-F675W
PHOT_COL(HST,V-R)                    PHOT_HST_CI_V-R              HST Color Index close to V-R, e.g. F555W-F675W
PHOT_COL(HST,R-I)                    PHOT_HST_CI_R-I              HST Color Index close to R-I, e.g. F675W-F814W
PHOT_MAG(HST,F569W)                  PHOT_HST_F569W               Magnitude F569W (HST)
PHOT_MAG(HST,F606W)                  PHOT_HST_F606W               Magnitude F606W (HST)
PHOT_COL(HST,V-I)                    PHOT_HST_CI_V-I              HST Color Index close to V-I, e.g. F555W-F814W
PHOT_MAG(HST,F622W)                  PHOT_HST_F622W               Magnitude F622W (HST)
PHOT_MAG(HST,F675W)                  PHOT_HST_F675W               Magnitude F675W (HST)
PHOT_MAG(HST,F702W)                  PHOT_HST_F702W               Magnitude F702W (HST)
PHOT_MAG(HST,F725LP)                 PHOT_HST_F725LP              Magnitude F725LP (HST)
PHOT_MAG(HST,F785LP)                 PHOT_HST_F785LP              Magnitude F785LP (HST)
PHOT_MAG(HST,F791W)                  PHOT_HST_F791W               Magnitude F791W (HST)
PHOT_MAG(HST,F814W)                  PHOT_HST_F814W               Magnitude F814W (HST)
PHOT_MAG(HST,F850LP)                 PHOT_HST_F850LP              Magnitude F850LP (HST)
PHOT_MAG(HST,V)                      PHOT_HST_V                   Magnitude V (visual) HST (unspecified filter name)
PHOT_COL()                           PHOT_INDX                      Photometric index (usually in narrow bands)
PHOT_COL(,HI)                        PHOT_INDX_HI                 Neutral hydrogen HI photometry index
PHOT_MAG()_INT                       PHOT_INT-MAG                   Integrated or isophotal magnitudes
PHOT_MAG(,B)_INT                     PHOT_INT-MAG_B               Integrated total or isophotal blue magnitude
PHOT_MAG(,I)_INT                     PHOT_INT-MAG_I               Integrated, total or isophotal, I magnitude
PHOT_MAG(UNK,)_INT                   PHOT_INT-MAG_MISC            Miscellaneous Integrated or isophotal magnitudes
PHOT_MAG(,R)_INT                     PHOT_INT-MAG_R               Integrated, total or isophotal, R magnitude
PHOT_MAG(,I)_INT                     PHOT_INT-MAG_U               Integrated, total or isophotal, V magnitude
PHOT_MAG(,V)_INT                     PHOT_INT-MAG_V               Integrated, total or isophotal, V magnitude
PHOT_INTENSITY_                      PHOT_INTENSITY                 Intensity
PHOT_INTENSITY_ADU                   PHOT_INTENSITY_ADU           Intensity expressed in ADU (analog to digital units)
PHOT_INTENSITY_ADU                   PHOT_INTENSITY_ESTIMATED     Estimated intensity
# What in astronomy is *not* estimated? 
PHOT_INTENSITY_ADU?                  PHOT_INTENSITY_MISC          Miscellaneous Intensity
PHOT_INTENSITY_RATIO                 PHOT_INTENSITY_NORMALIZED     Normalized intensity
SRC_IMAGE_RADIAL_PROFILE_INTENSITY   PHOT_INTENSITY_PROFILE       Intensity profile
PHOT_INTENSITY_RATIO                 PHOT_INTENSITY_RATIO         Intensity ratio
PHOT_MAG(,IR)                        PHOT_IR                        Infrared magnitudes (not well inserted in photometric systems)
PHOT_COL(IRAS,IRAS12-IRAS25)         PHOT_IR_12-25                Infrared color index 12-25 (IRAS)
PHOT_COL(CO 2.29mu,LINE-CONT)        PHOT_IR_2.29                 CO band index magnitude at 2.29 micron
PHOT_COL(IRAS<IRAS25-IRAS60)         PHOT_IR_25-60                Infrared IRAS color index 25-60 microns
PHOT_MAG(,3.4 mu)                    PHOT_IR_3.4                  Infrared magnitude at 3.4 microns
PHOT_MAG(,4.2 mu)                    PHOT_IR_4.2                  Infrared magnitude at 4.2 micron
PHOT_MAG(,BrkGamma)                  PHOT_IR_BGAMMA               Infrared Bracket Gamma magnitude
PHOT_MAG(,K-10 mu)                   PHOT_IR_K-10                 Infrared color index K-10 (K minus 10 microns)
PHOT_MAG(,K-IRAS100)                 PHOT_IR_K-100                Infrared color index K-100 (K minus 100 microns)
PHOT_MAG(,K-IRAS12)                  PHOT_IR_K-12                 Infrared color index K-12 (K minus 12 microns)
PHOT_MAG(,K-IRAS25)                  PHOT_IR_K-25                 Infrared color index K-25 (K minus 25 microns)
PHOT_MAG(,K-IRAS60)                  PHOT_IR_K-60                 Infrared color index K-60 (K minus 60 microns)
PHOT_MAG(,L0 3.7mu)                  PHOT_IR_L0                   Infrared magnitude L at 3.7 micron
PHOT_MAG(,FIR)                       PHOT_IR_MAG                  Far infrared magnitude mfir (may include IRAS bands)
PHOT_MAG(,N1 8.38mu)                 PHOT_IR_N1:8.38              Infrared magnitude at 8.38 microns
PHOT_MAG(,N2 9.69mu)                 PHOT_IR_N2:9.69              Infrared magnitude at 9.69 microns
PHOT_MAG(,N3 12.89mu)                PHOT_IR_N3:12.89             Infrared magnitude at 12.89 microns
PHOT_MAG(AZ,N)                       PHOT_IR_N:10.4               Infrared magnitude N at 10.4 microns
PHOT_MAG(AZ,Q)                       PHOT_IR_Q:18.06              Infrared magnitude at 18.06 microns
PHOT_MAG(J,)                         PHOT_JHN                       Johnson's Photometric system GCPD#8 GCPD#9
PHOT_MAG(J,B)                        PHOT_JHN_B                   Johnson magnitude B (JHN), centered at 450nm
PHOT_COL(J,B-H)                      PHOT_JHN_B-H                 Johnson color index B-H (JHN)
PHOT_COL(J,B-I)                      PHOT_JHN_B-I                 Johnson color index B-I (JHN)
PHOT_COL(J,B-K)                      PHOT_JHN_B-K                 Johnson color index B-K (JHN)
PHOT_COL(J,B-K')                     PHOT_JHN_B-K'                Johnson color index B-K' (JHN)
PHOT_COL(J,B-R)                      PHOT_JHN_B-R                 Johnson color index B-R (JHN)
PHOT_COL(J,B-V)                      PHOT_JHN_B-V                 Johnson color index B-V (JHN)
PHOT_MAG(J,H)                        PHOT_JHN_H                   Johnson magnitude H (JHN), centered at 1.62{mu}m
PHOT_COL(J,H-K)                      PHOT_JHN_H-K                 Johnson color index H-K (JHN)
PHOT_MAG(J,I)                        PHOT_JHN_I                   Johnson magnitude I (JHN), centered at 0.87{mu}m
PHOT_COL(J,I-K)                      PHOT_JHN_I-K                 Johnson color index I-K (JHN)
PHOT_MAG(J,J)                        PHOT_JHN_J                   Johnson magnitude J (JHN), also used in DENIS (1.25{mu}m)
PHOT_COL(J,J-H)                      PHOT_JHN_J-H                 Johnson color index J-H (JHN)
PHOT_COL(J,J-K)                      PHOT_JHN_J-K                 Johnson color index J-K (JHN)
PHOT_MAG(J,K)                        PHOT_JHN_K                   Johnson magnitude K (JHN), and Ks filter in DENIS (2.15{mu}m)
PHOT_MAG(J,K')                       PHOT_JHN_K'                  Johnson magnitude K' (JHN)
PHOT_COL(J,K-L)                      PHOT_JHN_K-L                 Johnson color index K-L (JHN), centered at 3.5{mu}m
PHOT_COL(J,K-L')                     PHOT_JHN_K-L'                Johnson color index K-L' (JHN)
PHOT_COL(J,K-M)                      PHOT_JHN_K-M                 Johnson color index K-M (JHN), centered at 5.0{mu}m
PHOT_COL(J,K-N)                      PHOT_JHN_K-N                 Johnson color index K-N (JHN), centered at 9.0{mu}m
PHOT_COL(J,K-Q)                      PHOT_JHN_K-Q                 Johnson color index K-Q (JHN)
PHOT_MAG(J,L)                        PHOT_JHN_L                   Johnson magnitude L (JHN) (3.5{mu}m)
PHOT_MAG(J,L')                       PHOT_JHN_L'                  Johnson magnitude L' (JHN)
PHOT_COL(J,L-M)                      PHOT_JHN_L-M                 Johnson color index L-M (JHN)
PHOT_MAG(J,M)                        PHOT_JHN_M                   Johnson magnitude M (JHN) (5.0{mu}m)
PHOT_MAG(J,)                         PHOT_JHN_MISC                Johnson Photometric system GCPD#8 GCPD#9
PHOT_MAG(J,N)                        PHOT_JHN_N                   Johnson flux magnitude N (JHN) (9.0{mu}m)
PHOT_MAG(J,R)                        PHOT_JHN_R                   Johnson magnitude R (JHN)
PHOT_COL(J,R-H)                      PHOT_JHN_R-H                 Johnson color index R-H (JHN)
PHOT_COL(J,R-I)                      PHOT_JHN_R-I                 Johnson color index R-I (JHN)
PHOT_COL(J,R-K)                      PHOT_JHN_R-K                 Johnson color index R-K
PHOT_MAG(J,U)                        PHOT_JHN_U                   Johnson magnitude U (JHN), centered at 360nm
PHOT_COL(J,U-B)                      PHOT_JHN_U-B                 Johnson color index U-B (JHN)
PHOT_COL(J,U-V)                      PHOT_JHN_U-V                 Johnson color index U-V (JHN)
PHOT_MAG(J,V)                        PHOT_JHN_V                   Johnson-Cousins magnitude V (JHN), centered at 555nm
PHOT_COL(J,V-H)                      PHOT_JHN_V-H                 Johnson color index V-H (JHN)
PHOT_COL(J,V-I)                      PHOT_JHN_V-I                 Johnson color index V-I (JHN)
PHOT_COL(J,V-J)                      PHOT_JHN_V-J                 Johnson color index V-J (JHN)
PHOT_COL(J,V-K)                      PHOT_JHN_V-K                 Johnson color index V-K (JHN)
PHOT_COL(J,V-L)                      PHOT_JHN_V-L                 Johnson color index V-L (JHN)
PHOT_COL(J,V-M)                      PHOT_JHN_V-M                 Johnson color index V-M (JHN)
PHOT_COL(J,V-N)                      PHOT_JHN_V-N                 Johnson color index V-N (JHN)
PHOT_COL(J,V-R)                      PHOT_JHN_V-R                 Johnson color index V-R (JHN)
PHOT_MAG()_K_CORR                    PHOT_K-CORRECTION              K correction
PHOT_MAG(LCKWD,)                     PHOT_LCKWD                     Lockwood photometric system GCPD#30
PHOT_COL(LCKWD,81-78)                PHOT_LCKWD_81-78             Color index 81-78 LCKWD
PHOT_MAG(UNK,)                       PHOT_MAG                       Magnitude of uncertain origin
PHOT_MAG(,5007A)                     PHOT_MAG_5007                Magnitude O III lambda 5007
PHOT_MAG(,B)                         PHOT_MAG_B                   Blue B magnitude
PHOT_MAG(,BLUE)                      PHOT_MAG_BLUE                Set of UCDs describing magnitudes in the "blue" region of the spectrum
PHOT_MAG()_CENTER                    PHOT_MAG_CENTR               Central magnitude
PHOT_MAG()_CORR                      PHOT_MAG_CORR                Magnitude correction
PHOT_MAG()_DROP                      PHOT_MAG_DROP                Drop in magnitude
PHOT_MAG(EYE,V)                      PHOT_MAG_EYE                 Eye estimated magnitude
PHOT_MAG(,HI)                        PHOT_MAG_HI                  Magnitude associated with neutral hidrogen
PHOT_MAG(,I)                         PHOT_MAG_I                   Near-Infrared magnitude around 0.8um (undefined or non-conventional system)
PHOT_MAG(,J)                         PHOT_MAG_J                   Near-Infrared magnitude around 1.2um (undefined or non-conventional system)
PHOT_MAG(,H)                         PHOT_MAG_H                   Near-Infrared magnitude around 1.6um (undefined or non-conventional system)
PHOT_MAG(,K)                         PHOT_MAG_K                   Near-Infrared magnitude around 2.2um (undefined or non-conventional system)
PHOT_MAG(,IR)                        PHOT_MAG_IR                  Set of UCDs describing infra-red magnitudes (NIR + FIR)
PHOT_MAG()_LIMIT                     PHOT_MAG_LIMIT               Magnitude limit
PHOT_MAG()_OFFSET                    PHOT_MAG_OFFST               Magnitude offset
PHOT_MAG(,OPT)                       PHOT_MAG_OPTICAL             Optical magnitude
PHOT_MAG(,R)                         PHOT_MAG_R                   Red (R) magnitude
PHOT_MAG(,RED)                       PHOT_MAG_RED                 Set of UCDs describing red magnitudes (lambda_eff &lt; 7000A)
PHOT_MAG(,U')                        PHOT_MAG_U                   U' magnitude (3402 A)
PHOT_MAG(UNK,)                       PHOT_MAG_UNDEF               Magnitude of uncertain origin or different bands in same column
PHOT_MAG(,UV)                        PHOT_MAG_UV                  Various Ultraviolet magnitude (TD1, ANS, FAUST, ...)
PHOT_MAG(,V)                         PHOT_MAG_V                   Visual magnitude
PHOT_MAG(,V)                         PHOT_MAG_VISUAL              Set of UCDs describing any magnitude near the "visual". eg, johnson's V
PHOT_MAG(PG,)                        PHOT_PHG                       Photographic magnitude Quantities
# The traditional notation for a phot mag is m sub pg
PHOT_MAG(PG,B)                       PHOT_PHG_B                   Photographic blue magnitude B (includes the O magnitude of POSS)
PHOT_COL(PG,B-R)                     PHOT_PHG_B-R                 Photographic color index B-R (includes the O-E color index from POSS)
PHOT_COL(PG,B-V)                     PHOT_PHG_B-V                 Photographic color index B-V
PHOT_MAG(PG,Bj)                      PHOT_PHG_BJ                  Photographic magnitude Bj
PHOT_COL(PG,Bj-Rf)                   PHOT_PHG_BJ-RF               Photographic color index Bj-Rf
PHOT_MAG(PG,I)                       PHOT_PHG_I                   Photographic magnitude I
PHOT_MAG(PG,R)                       PHOT_PHG_R                   Photographic red band magnitude R (includes E magnitude from POSS)
PHOT_COL(PG,U-B)                     PHOT_PHG_U-B                 Photographic color index U-B
PHOT_MAG(PG,)                        PHOT_PHG_MAG                 Photographic magnitude in unidentified band
PHOT_MAG(PG,U)                       PHOT_PHG_U                   Ultraviolet photographic magnitude
PHOT_COL(PG,U-V)                     PHOT_PHG_U-V                 Photographic color index U-V (ultraviolet minus photovisual)
PHOT_COL(PG,R-I)                     PHOT_PHG_R-I                 Photographic color index R-I
PHOT_MAG(PG,V)                       PHOT_PHG_V                   Photographic visual magnitude V
PHOT_COL(PG,V-R)                     PHOT_PHG_V-R                 Photographic color index V-R (or g-r)
SRC_IMAGE_RADIAL_PROFILE             PHOT_PROFILE                   Light distribution profile
SRC_IMAGE_RADIAL_PROFILE_SERSIC      PHOT_PROFILE_PAR             Light distribution's profile parameter, like Sersic's index
PHOT_FLUX(RADIO)                     PHOT_RADIO                     all radio data
PHOT_FLUX(cm)                        PHOT_RADIO_CM                Radio data 10cm &gt; lambda &gt; 1cm
PHOT_FLUX(UHF)                       PHOT_RADIO_DECI-M            Radio data 100cm &gt; lambda &gt; 10cm
PHOT_FLUX(submm)                     PHOT_RADIO_HI-FREQ           Radio data &gt; 100 GHz
PHOT_FLUX(cm/mm)                     PHOT_RADIO_INT-FREQ          Radio data 1GHZ &lt; nu &lt; 100GHz
PHOT_FLUX(VHF/HF)                    PHOT_RADIO_LOW-FREQ          Radio data &lt; 1GHz
# the above three are approximate renditions using the proposed bands
PHOT_FLUX(VHF)                       PHOT_RADIO_METRIC            Radio data lambda &gt; 100cm
PHOT_FLUX(mm)                        PHOT_RADIO_MM                Radio data 1 to 9.9 mm
PHOT_FLUX(submm)                     PHOT_RADIO_SUBMM             Radio data &lt; 1mm
PHOT_MAG()_DERED                     PHOT_RF                        Reddening Free Photometric Parameters
PHOT_MAG(UNK)_DERED                  PHOT_RF_MISC                 Miscellaneous reddening-free photometric indices
PHOT_COL(,B-L)_DERED                 PHOT_RF_B-L                  B-L extinction free color
PHOT_COL(,B_U)_DERED                 PHOT_RF_B-U                  B-U extinction free color
PHOT_DERED_Q                         PHOT_RF_Q                    Reddening free Q parameter
PHOT_COL(STR,)_DERED                 PHOT_RF_STR                  Reddening free indices in the Stroemgren system
PHOT_COL(STR,C0)_DERED               PHOT_RF_STR_C0             Dereddened color index parameter c0
PHOT_COL(STR,M0)_DERED               PHOT_RF_STR_M0             Dereddened color index parameter m0
PHOT_COL(,U-W)_DERED                 PHOT_RF_U-W                  U-W extinction free color
PHOT_MAG(,V)_DERED                   PHOT_RF_V                    Reddening free magnitude v
PHOT_MAG(GEN,X)_DERED                PHOT_RF_X                    Reddening free geneva photometry parameter
PHOT_MAG(GEN,Y)_DERED                PHOT_RF_Y                    Reddening free geneva photometry parameter
PHOT_MAG(GEN,Z)_DERED                PHOT_RF_Z                    Reddening free geneva photometry parameter
PHOT_SB_                             PHOT_SB                        Surface Brightness quantities
PHOT_COL()_SB                        PHOT_SB_CI                   Color index differential surface brightness
PHOT_SB_CODE                         PHOT_SB_CODE                 Encoded Surface Brigthness
PHOT_SB_DIFF                         PHOT_SB_DIFF                 Differential surface brightness
PHOT_SB                              PHOT_SB_GENERAL              Surface Brightness (in general)
PHOT_SB_MAG(GUNN,G)                  PHOT_SB_GUNN-G               Surface Brightness in Gunn G
PHOT_SB_MAG(IRAS,IRAS100)            PHOT_SB_IR-100               Surface Brightness at 100 micron
PHOT_SB_MAG(J,)                      PHOT_SB_JHN                  Surface Brightness in Johnson's System
PHOT_SB_MAG(J,B)                     PHOT_SB_JHN_B              Surface Brightness in Johnson B
PHOT_SB_COL(J,B-R)                   PHOT_SB_JHN_B-R            Surface brightness Johnson's color B-R
PHOT_SB_MAG(J,H)                     PHOT_SB_JHN_H              Surface Brightness in Johnson H
PHOT_SB_MAG(J,I)                     PHOT_SB_JHN_I              Surface Brightness in Johnson I
PHOT_SB_MAG(J,J)                     PHOT_SB_JHN_J              Surface Brightness in Johnson J
PHOT_SB_MAG(J,K)                     PHOT_SB_JHN_K              Surface Brightness in Johnson K
PHOT_SB_MAG(J,K')                    PHOT_SB_JHN_K'             Surface Brightness in Johnson K'
PHOT_SB_MAG(J,R)                     PHOT_SB_JHN_R              Surface Brightness in Johnson R
PHOT_SB_MAG(J,U)                     PHOT_SB_JHN_U              Surface Brightness in Johnson U
PHOT_SB_COL(J,U-R)                   PHOT_SB_JHN_U-R            Surface Brightness color index U-R
PHOT_SB_MAG(J,V)                     PHOT_SB_JHN_V              Surface Brightness in johnson V
PHOT_SB_MAG()_LIMIT                  PHOT_SB_LIMIT                Surface Brightness Limit
PHOT_SB_MAG()_RATIO                  PHOT_SB_RATIO                Surface Brightness Ratio
PHOT_SB_MAG()_SKY                    PHOT_SB_SKY                  Sky Surface Brightness
PHOT_SB_MAG()_SD_TO_SB               PHOT_SD/B-BRIGHT               Surface Density To Brightness Ratio
PHOT_MAG(SDSS,)                      PHOT_SDSS                      Sloan Digital Sky Survey photometric system (1996AJ....111.1748F)
PHOT_MAG(SDSS,u')                    PHOT_SDSS_U                  Magnitude in u' or u* filter of Sloan Digital Sky Survey (1996AJ....111.1748F)
PHOT_MAG(SDSS,g')                    PHOT_SDSS_G                  Magnitude in g' filter of Sloan Digital Sky Survey (1996AJ....111.1748F)
PHOT_MAG(SDSS,r')                    PHOT_SDSS_R                  Magnitude in r' filter of Sloan Digital Sky Survey (1996AJ....111.1748F)
PHOT_MAG(SDSS,i')                    PHOT_SDSS_I                  Magnitude in i' filter of Sloan Digital Sky Survey (1996AJ....111.1748F)
PHOT_MAG(SDSS,z')                    PHOT_SDSS_Z                  Magnitude in z' filter of Sloan Digital Sky Survey (1996AJ....111.1748F)
SPEC_             ?                  PHOT_SPHOT                     Spectrophotometric quantities (narrow bands)
SPEC_CONT_GRAD                       PHOT_SPHOT_CONT-GRAD         Pseudo Continuum Gradient
SPEC_CORRFACTOR                      PHOT_SPHOT_CORR-FACT         Spectrophotometry Correction Factor
SPEC_FLUX()                          PHOT_SPHOT_FLUX              Flux measured (in physical units) in a narrow-band filter (optical, near-IR or near-UV)
SPEC_COL()                           PHOT_SPHOT_INDEX             Spectrophotometric Index defined by various combinations of narrow-band fluxes
SPEC_FLUX()                          PHOT_SPHOT_INT-ENERGY        Intrinsic Energy in Narrow Spectral Band
PHOT_MAG(SPHOT,)                     PHOT_SPHOT_MAG               Normalized magnitude in a narrow spectral band
PHOT_MAG(STR,)                       PHOT_STR                       Stroemgren Photometric System GCPD#4
PHOT_MAG(STR,B)                      PHOT_STR_B                   Stroemgren Magnitude b (STR)
PHOT_MAG(STR,B-R)                    PHOT_STR_B-R                 Stroemgren Color Index b-r (STR)
PHOT_MAG(STR,B-V)                    PHOT_STR_B-V                 Stroemgren Color Index b-v (STR)
PHOT_MAG(STR,B-Y)                    PHOT_STR_B-Y                 Stroemgren Color Index b-y (STR)
PHOT_COL(STR,C1)                     PHOT_STR_C1                  Stroemgren Color Index c1 (STR)
PHOT_COL(STR,HBETA)                  PHOT_STR_HBETA               Stroemgren Beta Value
PHOT_COL(STR,M1)                     PHOT_STR_M1                  Stroemgren Color Index m1 (STR)
PHOT_MAG(STR,U)                      PHOT_STR_U                   Stroemgren Magnitude u (STR)
PHOT_COL(STR,U-B)                    PHOT_STR_U-B                 Stroemgren Color Index u-b (STR)
PHOT_COL(STR,U-V)                    PHOT_STR_U-V                 Stroemgren Color Index u-v (STR)
PHOT_MAG(STR,V)                      PHOT_STR_V                   Stroemgren Magnitude v (STR)
PHOT_COL(STR,V-B)                    PHOT_STR_V-B                 Stroemgren Color Index v-b (STR)
PHOT_COL(STR,V-Y)                    PHOT_STR_V-Y                 Stroemgren Color Index v-y (STR)
PHOT_MAG(STR,Y)                      PHOT_STR_Y                   Stroemgren Magnitude y (STR)
OBS_COV_BAND_NAME                    PHOT_SYS-ID                    Identification of the Photometric System in use
-                                    PHOT_TRANSF                    Transformation of a Photometry, like conversion parameters between photometric systems
PHOT_TRANSF_PARAM?                   PHOT_TRANSF_PARAM              Parameter used in photometric transformations
PHOT_MAG()_OVER_SB                   PHOT_TOT-BRIGHT/B-BRIGHT       Total blue magnitude to Brightness ratio
PHOT_MAG(TYCHO,)                     PHOT_TYCHO                     Tycho Photometric System
PHOT_MAG(TYCHO,B)                    PHOT_TYCHO_B                 Blue Tycho Magnitude B_T_
PHOT_MAG(TYCHO,V)                    PHOT_TYCHO_V                 Visual Tycho Magnitude V_T_
PHOT_MAG(UBVR20,)                    PHOT_UBVR20                    UBVr20 Photometric System GCPD#69
PHOT_COL(UBVR20,B-V20)               PHOT_UBVR20_B-V20            Color Index B-V20 (UBVr20)
PHOT_COL(UBVR20,U-B20)               PHOT_UBVR20_U-B20            Color Index U-B20 (UBVr20)
PHOT_COL(UBVR20,V-R20)               PHOT_UBVR20_V-R20            Color Index V-r20 (UBVr20)
PHOT_MAG(UV,)                        PHOT_UV                        UV Magnitude Photometry number # &lt;= Lambda_central &lt; #+100
PHOT_MAG(UV,1300A)                   PHOT_UV_1300                 Far UV Magnitude 1300 to 1400 Angstrom UV
PHOT_MAG(UV,1400A)                   PHOT_UV_1400                 Far UV Magnitude 1400 to 1500 Angstrom UV
PHOT_MAG(UV,1500A)                   PHOT_UV_1500                 Far UV Magnitude 1500 to 1600 Angstrom UV
PHOT_MAG(UV,1600A)                   PHOT_UV_1600                 Far UV Magnitude 1600 to 1700 Angstrom UV
PHOT_MAG(UV,1700A)                   PHOT_UV_1700                 UV Magnitude 1700 to 1800 Angstrom UV
PHOT_MAG(UV,1800A)                   PHOT_UV_1800                 UV Magnitude 1800 to 1900 Angstrom UV
PHOT_MAG(UV,1900A)                   PHOT_UV_1900                 UV Magnitude 1900 to 2000 Angstrom UV
PHOT_MAG(UV,2000A)                   PHOT_UV_2000                 UV Magnitude 2000 to 2100 Angstrom UV
PHOT_MAG(UV,2200A)                   PHOT_UV_2200                 UV Magnitude 2200 to 2300 Angstrom UV
PHOT_MAG(UV,2300A)                   PHOT_UV_2300                 UV Magnitude 2300 to 2400 Angstrom UV
PHOT_MAG(UV,2400A)                   PHOT_UV_2400                 Near UV Magnitude 2400 to 2500 Angstrom UV
PHOT_MAG(UV,2500A)                   PHOT_UV_2500                 Near UV Magnitude 2500 to 2600 Angstrom UV
PHOT_MAG(UV,2700A)                   PHOT_UV_2700                 Near UV Magnitude 2700 to 2800 Angstrom UV
PHOT_MAG(UV,2945A)                   PHOT_UV_2945                 Near UV Magnitude 2900 to 3000 Angstrom UV
PHOT_MAG(UV,3150A)                   PHOT_UV_3150                 Near UV Magnitude 3100 to 3200 Angstrom UV
PHOT_MAG(UV,3300A)                   PHOT_UV_3300                 Near UV Magnitude 3300 to 3400 Angstrom UV
PHOT_MAG(UV,4250A)                   PHOT_UV_4250                 Near UV Magnitude 4200 to 4300 Angstrom UV
PHOT_COL(UV,)                        PHOT_UV_COLOR                Ultraviolet Color Index (no bands specified)
PHOT_MAG(UV,)                        PHOT_UV_GENERAL              UV Magnitude unspecified band
PHOT_MAG(UVBGRI,)                    PHOT_UVBGRI                    UVBGRI Photometric System GCPD#6
PHOT_MAG(UVBGRI,B)                   PHOT_UVBGRI_B                Filter Blue Magnitude UVBGRI
PHOT_MAG(UVBGRI,G)                   PHOT_UVBGRI_G                Filter Green Magnitude UVBGRI
PHOT_MAG(UVBGRI,I)                   PHOT_UVBGRI_I                Filter Infra Magnitude UVBGRI
PHOT_MAG(UVBGRI,R)                   PHOT_UVBGRI_R                Filter Red Magnitude UVBGRI
PHOT_MAG(UVBGRI,U)                   PHOT_UVBGRI_U                Filter Ultra Magnitude UVBGRI
PHOT_MAG(UVBGRI,V)                   PHOT_UVBGRI_V                Filter Violet Magnitude UVBGRI
PHOT_MAG(VIL,)                       PHOT_VIL                       Vilnius Photometric System GCPD#21
PHOT_COL(VIL,P-X)                    PHOT_VIL_P-X                 Vilnius Color Index p-x (VIL)
PHOT_COL(VIL,S-V)                    PHOT_VIL_S-V                 Vilnius Color Index s-v (VIL)
PHOT_COL(VIL,U-P)                    PHOT_VIL_U-P                 Vilnius Color Index u-p (VIL)
PHOT_COL(VIL,U-V)                    PHOT_VIL_U-V                 Vilnius Color Index u-v (VIL)
PHOT_MAG(VIL,V)                      PHOT_VIL_V                   Magnitude V Vilnius (VIL)
PHOT_COL(VIL,V-P)                    PHOT_VIL_V-P                 Vilnius Color Index v-p (VIL)
PHOT_COL(VIL,V-S)                    PHOT_VIL_V-S                 Vilnius Color Index v-s (VIL)
PHOT_COL(VIL,V-W)                    PHOT_VIL_V-W                 Vilnius Color Index v-w
PHOT_COL(VIL,V-X)                    PHOT_VIL_V-X                 Vilnius Color Index v-x (VIL)
PHOT_COL(VIL,V-Z)                    PHOT_VIL_V-Z                 Vilnius Color Index v-z (VIL)
PHOT_MAG(VIL,X)                      PHOT_VIL_X                   Magnitude X Vilnius (VIL)
PHOT_COL(VIL,X-Y)                    PHOT_VIL_X-Y                 Vilnius Color Index x-y (VIL)
PHOT_COL(VIL,Y-Z)                    PHOT_VIL_Y-Z                 Vilnius Color Index y-z (VIL)
PHOT_COL(VIL,Z-V)                    PHOT_VIL_Z-V                 Vilnius Color Index z-v (VIL)
PHOT_MAG(WASH,)                      PHOT_WASH                      Washington Photometric System GCPD#48
PHOT_COL(WASH,C-M)                   PHOT_WASH_C-M                Washington Color Index c-m (WASH)
PHOT_COL(WASH,C-T1)                  PHOT_WASH_C-T1               Washington Color Index c-t1 (WASH)
PHOT_COL(WASH,D)                     PHOT_WASH_D                  Washington Abundance Indicator D (WASH)
# Is the abundance indicator basically a color?
PHOT_COL(WASH,M-T1)                  PHOT_WASH_M-T1               Washington Color Index m-t1 (WASH)
PHOT_COL(WASH,M-T2)                  PHOT_WASH_M-T2               Washington Color Index m-t2 (WASH)
PHOT_MAG(WASH,T1)                    PHOT_WASH_T1                 Washington Magnitude t1 (WASH)
PHOT_MAG(WLRV,)                      PHOT_WLRV                      Walraven Photometric System GCPD#11
PHOT_MAG(WLRV,B)                     PHOT_WLRV_B                  Walraven Magnitude (flux intensity) B (WLRV)
PHOT_COL(WLRV,B-L)                   PHOT_WLRV_B-L                Walraven Color Index B-L (WLRV)
PHOT_COL(WLRV,B-U)                   PHOT_WLRV_B-U                Walraven Color Index B-U (WLRV)
PHOT_COL(WLRV,B-W)                   PHOT_WLRV_B-W                Walraven Color Index B-W (WLRV)
PHOT_MAG(WLRV,L)                     PHOT_WLRV_L                  Walraven Magnitude (Flux Intensity) L (WLRV)
PHOT_MAG(WLRV,U)                     PHOT_WLRV_U                  Walraven Magnitude (Flux Intensity) U (WLRV)
PHOT_COL(WLRV,U-W)                   PHOT_WLRV_U-W                Walraven Color Index U-W (WLRV)
PHOT_MAG(WLRV,V)                     PHOT_WLRV_V                  Walraven Magnitude (Flux Intensity) V (WLRV)
PHOT_COL(WLRV,V-B)                   PHOT_WLRV_V-B                Walraven Color Index V-B (WLRV)
PHOT_MAG(WLRV,W)                     PHOT_WLRV_W                  Walraven Magnitude (Flux Intensity) W (WLRV)
PHOT_MAG()_ZERO                      PHOT_ZP                        Zero point coefficient for the photometric system
PHYS_                                PHYS                             Physical Quantities
MED_MATTER_ABUND_                    PHYS_ABUND                     Abundances
MED_MATTER_ABUND()                   PHYS_ABUND_MISC              Abundance (other than H, He, and Fe)
MED_MATTER_ABUND_X                   PHYS_ABUND_X                 Hydrogen Abundance (X)
MED_MATTER_ABUND_Y                   PHYS_ABUND_Y                 Helium Abundance (Y)
MED_MATTER_ABUND_Z                   PHYS_ABUND_Z                 Metal Abundance Z (metallicity)
MED_MATTER_ABUND_FEH                 PHYS_ABUND_[FE/H]            Fe to H Abundance (Metallicity)
OBJ_ALBEDO                           PHYS_ALBEDO                    Albedo
OBJ_ANGMOM                           PHYS_ANG-MOMENTUM              Angular Momentum
-                                    PHYS_AREA                      Physical quantities related to Area
PHYS_PARTICLE_XSECT                  PHYS_AREA_CR-SECT            Cross Section
?                                    PHYS_AREA_GENERAL            Area (in general)
PHYS_BODY_FLATTENING                 PHYS_AXIS-RATIO                Axis Ratio
-                                    PHYS_BRIGHT                    Object's brightness quantities
SRC_VAR_BRIGHT                       PHYS_BRIGHT_CHANGE           Brightness Change
# This is the change in an astronomical source...
-                                   PHYS_COLUMN                    Line Of Sight Column Properties
LOS_NUMBER_COL                      PHYS_COLUMN_DENSITY          Column Density (by number of particles)
LOS_MASS_COL                        PHYS_COLUMN_MASS-DENSITY     Mass Column Density
SRC_COMPACTNESS                     PHYS_COMPACTNESS               Compactness Indicator
SRC_CONCENT                         PHYS_CONCENT                   Concentration Indicators
SRC_CONCENT_INDEX?                  PHYS_CONCENT_INDEX           Concentration Index
MED_MATTER_DENSITY                  PHYS_DENSITY                   Density (various flavours)
MED_MATTER_NE                       PHYS_DENSITY_ELECT           Electron Density
MED_ENERGY_DENSITY                  PHYS_DENSITY_ENERGY          Energy Density
MED_MATTER_DENSITY                  PHYS_DENSITY_MASS            Mass Density
MED_MATTER_SURF_DENSITY             PHYS_DENSITY_MASS_SURF     Surface Mass-Density
MED_MATTER_MASSVOL_DENSITY?         PHYS_DENSITY_MASS_VOL      Volume Mass-Density
MED_MATTER_NUM_DENSITY              PHYS_DENSITY_NUMBER          Number Density
MED_MATTER_DENSITY_RATIO            PHYS_DENSITY_RATIO           Density Ratio
MED_MATTER_SURF_NUM_DENSITY         PHYS_DENSITY_SURFACE         Surface Density
LOS_DISP_MEASURE                    PHYS_DISP-MEASURE              Dispersion Measure
OBJ_DISTANCE                        PHYS_DISTANCE                  Distance and related quantities
OBJ_DISTANCE_DIFF                   PHYS_DISTANCE_DIFF           Distance Difference
OBJ_DISTANCE_RATIO                  PHYS_DISTANCE_NORM           Relative or Normalized Distance
OBJ_DISTANCE_PROJ                   PHYS_DISTANCE_PROJ           Projected Distance
OBJ_DISTANCE_RATIO                  PHYS_DISTANCE_RATIO          Distance Fraction or Ratio
OBJ_DISTANCE_RATIO                  PHYS_DISTANCE_RELATIVE       Relative Distance
OBJ_DISTANCE                        PHYS_DISTANCE_TRUE           Distance (true, linear distance)
ORBIT_ELT_E                         PHYS_ECCENTRICITY              Eccentricity
MED_FIELDS_ELEC                     PHYS_ELEC-FIELD                Electric (electrostatic) Field
OBJ_ELLIPTICITY                     PHYS_ELLIPTICITY               Ellipticity (1-b/a)
MED_MATTER_EMMEASURE                PHYS_EM-MEASURE                Emission Measure
_ENERGY                             PHYS_ENERGY                    Energy and related quantities
?                                   PHYS_ENERGY_CONTRIB          Energy Contribution
?                                   PHYS_ENERGY_GENERAL          Energy in general
SPEC_SLOPE_ENERGY ?                 PHYS_ENERGY_INDEX            Energy Index
PHYS_AT_ION_ENERGY                  PHYS_ENERGY_ION              Ion Energy
MED_MATTER_COOLING_RATE             PHYS_ENERGY_LOSS-RATE        Energy Loss Rate
SPEC_PHOTON_ENERGY                  PHYS_ENERGY_X                X-ray or Gamma-ray Energy
# WHy do we care it is X?
?                                   PHYS_EXCITATION                Excitation in the Context of Ionizing Photons
MED_MATTER_EXCITE_PARAM             PHYS_EXCITATION_PARAM        Excitation Parameter
OBJ_MATTER_MDOT         ?           PHYS_FLOW                      Matter Flow or Outflows Quantities
MED_MATTER_FLOW_POLARITY            PHYS_FLOW_POLARITY           Flow Polarity
-                                   PHYS_GRADIENT                  Gradients (usually on galaxy context)
MED_MATTER_CHEM_GRADIEN             PHYS_GRADIENT_CHEMICAL       Chemical Gradient
PHOT_COL()_GRADIENT                 PHYS_GRADIENT_CI             Color Index Gradient
_GRADIENT                           PHYS_GRADIENT_GENERAL        General gradients (usually on galaxy context)
PHOT_SB_MAG()_GRADIENT              PHYS_GRADIENT_SB             Surface Brightness Gradient
MED_MATTER_TEMP_GRADIENT            PHYS_GRADIENT_TEMP           Temperature Gradient
MED_MATTER_VEL_GRADIENT             PHYS_GRADIENT_VELOCITY       Velocity Gradient
-                                   PHYS_GRAVITY                   Gravity and related properties
MED_GRAVITY_POTL                    PHYS_GRAVITY_POTENTIAL       Gravitational Potential
MED_GRAVITY_PRESS                   PHYS_GRAVITY_PRESS           Gravitational pressure
OBJ_SURFACE_GRAVITY                 PHYS_GRAVITY_SURFACE         Surface Gravity
_HEIGHT                             PHYS_HEIGHT                    Height or depth (usually in an atmospheric context)
LOS_IMPACT_PAR                      PHYS_IMPACT-PAR                Impact Parameter
MED_RAD_IC_BEAMING                  PHYS_INV-COMPTON-BEAM-FACT       Inverse Compton Effect Beam Factor
MED_MATTER_IONIZATION               PHYS_IONIZATION                Ionization quantities (in stellar/interstellar environments)
MED_MATTER_IONPARAM                 PHYS_IONIZATION_PARAM        Ionization Parameter
MED_RAD_FLUX_N_IONIZING             PHYS_IONIZATION_PHOTONS      Ionizing Photons
MED_RAD_FLUX_FRAC_IONIZING          PHYS_IONIZATION_PHOTONS_RATIO   Ionizing Photon Ratio
MED_RAD_FLUX_N_IONIZING?            PHYS_IONIZATION_PHOTONS_TOTAL   Total ionizing Photons
_LENGTH                             PHYS_LENGTH                    Length related quantities
_LENGTH_RATIO?                      PHYS_LENGTH_RATIO            Length Ratio
-                                   PHYS_LIMB-DARK                 Limb Darkening Phenomena
SRC_LIMBDARK_COEFF                  PHYS_LIMB-DARK_COEFF         Limb Darkening Coefficient
SRC_LUM()                           PHYS_LUMINOSITY                Luminosity, in different bands and types
SRC_LUM(B)                          PHYS_LUMINOSITY_B            Luminosity in blue light
SRC_LUM(CIV)                        PHYS_LUMINOSITY_CARBON       Carbon luminosity
SRC_LUM(CONT)                       PHYS_LUMINOSITY_CONTINUUM     Continuum luminosity
SRC_LUM_DENSITY                     PHYS_LUMINOSITY_DENSITY      Luminosity density
_LUM                                PHYS_LUMINOSITY_GENERAL      Luminosity in general
SRC_LUM(H2O MASER)                  PHYS_LUMINOSITY_H2O          Water maser luminosity
SRC_LUM(HALPHA)                     PHYS_LUMINOSITY_HALPHA       H alpha luminosity
SRC_LUM(HBETA)                      PHYS_LUMINOSITY_HBETA        H beta luminosity
SRC_LUM(HE) ?                       PHYS_LUMINOSITY_HE           Helium luminosity
SRC_LUM(H?) ?                       PHYS_LUMINOSITY_HYDROG       Hydrogen luminosity
SRC_LUM(IR)                         PHYS_LUMINOSITY_IR           Infrared luminosity
SRC_LUM(IRAS100)                    PHYS_LUMINOSITY_IR_100     Luminosity at 100 micron
SRC_LUM(IRAS12)                     PHYS_LUMINOSITY_IR_12      Luminosity at 12 micron
SRC_LUM(IRAS25)                     PHYS_LUMINOSITY_IR_25      Luminosity at 25 micron
SRC_LUM(IRAS60)                     PHYS_LUMINOSITY_IR_60      Luminosity at 60 micron
SRC_LUM(IR)                         PHYS_LUMINOSITY_IR_MISC    Infrared luminosity in general
SRC_LUM()_MASER                     PHYS_LUMINOSITY_MASER        Maser luminosity
SRC_NU_LUM                          PHYS_LUMINOSITY_NU           Neutrino luminosity
SRC_LUM(OH)                         PHYS_LUMINOSITY_OH           OH luminosity
SRC_IMAGE_LUM()_PROFILE             PHYS_LUMINOSITY_PROFILE      Luminosity profile
SRC_LUM(R)                          PHYS_LUMINOSITY_R            Luminosity in red light
SRC_LUM(RADIO)                      PHYS_LUMINOSITY_RADIO        Radio luminosity
SRC_LUM()_RATIO                     PHYS_LUMINOSITY_RATIO        Luminosity ratio
SRC_LUM()_SURFACE                   PHYS_LUMINOSITY_SURFACE      Surface luminosity
SRC_LUM(UV)                         PHYS_LUMINOSITY_UV           Ultraviolet luminosity
SRC_LUM(UV_LYA)                     PHYS_LUMINOSITY_UV_LYA     Ionizing ultraviolet luminosity in lyman alpha
SRC_LUM(UV)                         PHYS_LUMINOSITY_UV_MISC    Ultraviolet luminosity
SRC_LUM(XR)                         PHYS_LUMINOSITY_X            X-ray luminosity
MED_FIELDS_MAG                      PHYS_MAG-FIELD                 Magnetic Field
-                                   PHYS_MASS                      Mass and related quantities
?                                   PHYS_MASS_ABS-COEFF          Mass Absorption Coefficient
MED_MATTER_MASS_FLUX                PHYS_MASS_FLUX               Mass flux or flow
OBJ_MASS_RATIO?                     PHYS_MASS_FRACTIONAL         Fractional Mass
OBJ_MASS_FN                         PHYS_MASS_FUNCTION           Function of mass, typically in spectroscopic binaries (M2*sini)^3^/(M1+M2)^2^
OBJ_MDOT                            PHYS_MASS_LOSS               Mass Loss
OBJ_MASS                            PHYS_MASS_MISC               Mass
OBJ_MASS_RATIO                      PHYS_MASS_RATIO              Mass Ratio
PHYS_AT_MASS_YIELD                  PHYS_MASS_YIELD              Mass yield associated to a given element
OBJ_MASS_LIGHT_RATIO                PHYS_MASS/LIGHT              Mass to Light Ratio
MED_RAD_OPACITY                     PHYS_OPACITY                   Opacity
MED_RAD_TAU                         PHYS_OPTICAL-DEPTH             Optical Depth
MED_MATTER_OUTFLOW                  PHYS_OUTFLOW                   Outflows related quantities
MED_MATTER_OUTFLOW_PARAM            PHYS_OUTFLOW_PARAM           Outflow Parameter Factor
-                                   PHYS_PLASMA                    Plasma Physics Parameters
MED_MATTER_PLASMA_PARAM             PHYS_PLASMA_PARAM            Plasma Physics Parameters
MED_MATTER_PLASMA_GAUNT             PHYS_PLASMA_GAUNT-FACT       Plasma Physics Gaunt Factor
_PRESS                              PHYS_PRESS                     Pressure and related quantities
MED_MATTER_PRESS_E                  PHYS_PRESS_ELECT             Electron Pressure
MED_MATTER_PRESS_GAS                PHYS_PRESS_GAS               Gas Pressure
OBJ_RADIUS_MAXROT                   PHYS_RAD-MAX-ROT-VEL           Radius at which maximum rotational velocity occurs
MED_MATTER_ACCEL_RAD                PHYS_RADIATIVE-ACCEL           Radiative Acceleration
OBJ_REFLECTANCE?                    PHYS_REFLECTANCE               Reflectance
MED_MATTER_REFRACT-INDX             PHYS_REFRACT-INDX              Refraction Index
MED_RAD_ROTN_MEASURE                PHYS_ROTATION-MEASURE          Rotation Measure
_SCALE                              PHYS_SCALE                     Quantities Representing a Scale
_SCALE_HEIGHT                       PHYS_SCALE_HEIGHT            Scale Height
_SCALE_LENGTH                       PHYS_SCALE_LENGTH            Scale Length
OBJ_SEPARATION                      PHYS_SEPARATION                Pair Separation (in non-angular units)
-                                   PHYS_SIZE                      Size (in non-angular units)
OBJ_DIA                             PHYS_SIZE_DIAM               Diameter
OBJ_DIA_MAJ                         PHYS_SIZE_MAJ                Size (diameter) measured along the major axis
OBJ_DIA_MIN                         PHYS_SIZE_MIN                Size (diameter) measured along the minor axis
OBJ_RADIUS                          PHYS_SIZE_RADIUS             Radius and related quantities
OBJ_RADIUS                          PHYS_SIZE_RADIUS_GENERAL   Linear Radius
OBJ_RADIUS_RATIO                    PHYS_SIZE_RADIUS_NORM      Normalized Radius
OBJ_RADIUS_RATIO?                   PHYS_SIZE_RATIO              Size Ratio
OBJ_RADIUS_MAJ                      PHYS_SIZE_SMAJ               Size Of The Semi Major Axis
OBJ_RADIUS_MAJ                      PHYS_SIZE_SMAJ_GENERAL     Size Of The Semi Major Axis
OBJ_RADIUS_MAJ_RATIO                PHYS_SIZE_SMAJ_NORM        Normalized Size of the Major Axis
OBJ_RADIUS_MIN                      PHYS_SIZE_SMIN               Size of the Semi Minor Axis
OBJ_RADIUS_MIN_RATIO                PHYS_SIZE_SMIN_NORM        Normalized Size of the Minor Axis
-                                   PHYS_STAR-FORM                 Star Formation Related Quantities
POP_SFR                             PHYS_STAR-FORM_RATE          Star Formation Rate
-                                   PHYS_SUN                       Solar Related Quantities
-                                   PHYS_SUN_ATM                 Quantities Related to the Solar Atmosphere
OBJ(SUN)_ATM_ABSCOEFF               PHYS_SUN_ATM_ABS-COEFF     Solar Spectral Absorption Coefficient
OBJ(SUN)_ATM_PARAM                  PHYS_SUN_ATM_PARAM         Solar Atmosphere Parameter
?                                   PHYS_SUN_HARM/FUN-BAND-FREQ-RATIO     Harmonic to Fundamental Frequency Ratio
?                                   PHYS_TANG-DOPPLER-FACT         Tangential Doppler Effect Factor
_TEMP                               PHYS_TEMP                      Temperature and related quantities
_TEMP_DIFF                          PHYS_TEMP_DIFF               Temperature Amplitude or difference
SPEC_TEMP_EFF                       PHYS_TEMP_EFFEC              Effective Temperature
MED_MATTER_TEMP_E                   PHYS_TEMP_ELECT              Electron Temperature
PHYS_AT_TEMP_EXCIT                  PHYS_TEMP_EXCIT              Excitation Temperature
MED_MATTER_TEMP_FF                  PHYS_TEMP_F-F                Free-free or Bremsstrahlung Temperature
MED_MATTER_TEMP_KINETIC             PHYS_TEMP_KINETIC            Kinetic Temperature
MED_MATTER_TEMP                     PHYS_TEMP_MISC               Temperature in general
MED_MATTER_TEMP                     PHYS_TEMP_PLASMA             Plasma Temperature
MED_MATTER_TEMP_THETA               PHYS_TEMP_THETA              Effective temperature theta (5040/Teff)
MED_MATTER_TEMP                     PHYS_TEMP_XRAY               X Ray temperature
OBJ_TYPE                            PHYS_TYPE                      Type of Phenomenon or Event
_VOLUME                             PHYS_VOLUME                    Volume
_VOLUME_RATIO                       PHYS_VOLUME_RATIO            Volume Ratio
OBJ_WIND                            PHYS_WIND                      Stellar or Solar Wind Properties
OBJ_WIND_LUM                        PHYS_WIND_LUMINOSITY         Wind Luminosity
SPEC_POL                            POL                              Polarization Related Quantities
SPEC_POL_FRAC                       POL_DEGREE                     Degree of Polarization
SPEC_POL_FRAC_CIRC                  POL_DEGREE_CIRC              Degree of Circular polarization
SPEC_POL_FRAC_LIN                   POL_DEGREE_LINEAR            Degree of Linear polarisation
SPEC_POL_FRAC                       POL_DEGREE_MISC              Degree of Polarization (unspecified type)
SPEC_FLUX()_POL                     POL_FLUX                       Polarized Flux (two flavours)
SPEC_FLUX()_POL_LCP                 POL_FLUX_LCP                 Left Circular Polarization Flux
SPEC_FLUX()_POL_LIN                 POL_FLUX_LINEAR              Linearly polarized flux density
SPEC_FLUX()_POL_RCP                 POL_FLUX_RCP                 Right Circular Polarization Flux
SPEC_POL_INDEX                      POL_INDEX                      Polarization Index
SPEC_POL_LAMBDAMAX                  POL_LAMBDA-MAX                 Maximum Polarization's Wavelength
SPEC_POL_LIN_TO_CIRC                POL_LINEAR/CIRC                Ratio of Linear to Circular Polarization
SPEC_POL_PA()                       POL_PA                         Position Angle of the Polarization vector
SPEC_POL_PA(EQ)                     POL_PA_EQ                    Position Angle in Equatorial Coordinates of the Polarization vector
SPEC_POL_PA(GAL)                    POL_PA_GAL                   Position Angle in Galactic Coordinates of the Polarization vector
SPEC_POL_PA(*POS_FRAME)             POL_PA_MISC                  Vector's Position Angle in unspecified coordinate system
SPEC_POL_SENSE                      POL_SENSE                      Sense Of Polarization
SPEC_POL_SLOPE                      POL_SLOPE                      Polarimetry Slope
SPEC_POL_STOKES_                    POL_STOKES                     Polarization Stokes Parameters
SPEC_POL_STOKES_I                   POL_STOKES_I                   Stokes parameter I (total power)
SPEC_POL_STOKES_Q                   POL_STOKES_Q                   Stokes Parameter Q (absolute, or relative Q/I) [horizontal/vertical component]
SPEC_POL_STOKES_U                   POL_STOKES_U                   Stokes Parameter U (absolute, or relative U/I) [diagonal component]
SPEC_POL_STOKES_V                   POL_STOKES_V                   Stokes Parameter V (absolute, or relative V/I) [circular component]
_POS_                               POS                              Position Related Quantities
OBJ_POS_ANG_ ?                      POS_ANG                        Angular Position
OBJ_SEP_ANG                         POS_ANG_DIST                 Angular Distance and related quantities
OBJ_SEP_ANG                         POS_ANG_DIST_GENERAL       Angular Distance Or Separation
OBJ_SEP_ANG_RATIO                   POS_ANG_DIST_REL           Relative or Normalized Angular Distance
OBJ_SEP_ANG_DIST_SQ                 POS_ANG_DIST_SQ            Quadratic Angular Distance
OBJ_POS_ANG_VEL                     POS_ANG_VEL                  Rate Of Position Change (drift motion, angular velocity)
_POS_CCD_                           POS_CCD                        Positions Related To CCD's
_POS_CCD_X                          POS_CCD_X                    CCD Position Along the X Axis
_POS_CCD_Y                          POS_CCD_Y                    CCD Position Along the Y Axis
_POS_DET                            POS_DETECTOR                   Position Related to the Detector
_POS_DET_DIST                       POS_DETECTOR_DIST            Distance Or Position In Detector Units
_POS_R_PIX                          POS_DETECTOR_RADIUS          Radius of an Object Expressed In Detector's Unit
POS()_NX                            POS_DIR-COSINE                 Direction Cosine
POS(GEO,GEO)                        POS_EARTH                      Positions On The Earth
POS(GEO,GEO)_LAT                    POS_EARTH_LAT                Earth's Latitude
POS(GEO,GEO)_LAT                    POS_EARTH_LAT_MAIN         Earth's Latitude
OBJ(E)_LAT_VAR  ?                   POS_EARTH_LAT_VAR          Variation of Local Latitude
OBS_SITE                            POS_EARTH_LOCATION           Earth Location
POS(GEO,GEO)_LON                    POS_EARTH_LON                Earth Longitude
POS(,EC)                            POS_EC                         Ecliptic Coordinates and derivates
POS(,EC)_LAT                        POS_EC_LAT                   Ecliptic Latitude
POS(,EC)_LON                        POS_EC_LON                   Ecliptic Longitude
POS(,EQ)                            POS_EQ                         Equatorial Coordinates and related quantities
?                                   POS_EQ_A-V-PRECESS           Annual Variation of Precession in RA
POS(,EQ)_X                          POS_EQ_X                     X component of equatorial position: x=cos(Dec)cos(RA)
POS(,EQ)_Y                          POS_EQ_Y                     Y component of equatorial position: y=cos(Dec)sin(RA)
POS(,EQ)_Z                          POS_EQ_Z                     Z component of equatorial position: z=sin(Dec)
POS(,EQ)_DEC                        POS_EQ_DEC                   Declination related quantities
POS(,EQ)_DEC:3                      POS_EQ_DEC_3T              Third Term in Declination
POS(,EQ)_DEC                        POS_EQ_DEC_MAIN            Declination
POS(,EQ)_REL_DEC                    POS_EQ_DEC_OFF             Declination Offset Difference
POS_EQ_DEC_OTHER                    POS_EQ_DEC_OTHER           Declination in Non-Standard Units or partial values
POS_EQ_DEC_PRECESS                  POS_EQ_DEC_PRECESS         Precession Variation in Declination
POS(,EQ)_REL_DEC                    POS_EQ_DEC_REL             Relative Declination in a Special Scale
-                                   POS_EQ_PLX                   Relations between Parallax and RA and Dec
POS()_R_PLX_FAC                     POS_EQ_PLX_FACTOR          Parallax Factor in Declination
POS(,EQ)_PMDEC                      POS_EQ_PMDEC               Proper Motion in Declination (pmdec)
POS(,EQ)_PM                         POS_EQ_PM                  Total proper motion (can be in non-equatorial frame)
POS(,EQ)_PMPA                       POS_EQ_PM-PA               Position angle (North through East) of Proper Motion vector
POS(,EQ)_PMRA                       POS_EQ_PMRA                Proper Motion in Right Ascension (pmra)
# Proper motion is a valid concept for any sky system
POS(,EQ)_PREC                       POS_EQ_PREC                  Annual Precesion Quantities
# Precession is only relevant for systems fixed in the Earth's body
POS(,EQ)_PREC_DEC                   POS_EQ_PREC_DEC            Annual Precession In Declination
POS(,EQ)_PREC_RA                    POS_EQ_PREC_RA             Precession Variation In RA
POS(,EQ)_RA                         POS_EQ_RA                    Right Ascension related quantities
POS(,EQ)_RA:2                       POS_EQ_RA_2T               Second Component in right Ascension
POS(,EQ)_RA:3                       POS_EQ_RA_3T               Third Term In Right Ascension
POS(,EQ)_CORR_RA                    POS_EQ_RA_CORR             Correction in Right Ascension
POS(,EQ)_RA                         POS_EQ_RA_MAIN             Right Ascension
POS(,EQ)_CORR_RA                    POS_EQ_RA_OFF              RA Offset or Residual In Right Ascension
POS(,EQ)_RA_OTHER?                  POS_EQ_RA_OTHER            Right Ascension in Non-Standard Units or partial values
POS(,EQ)_CORR_RA                    POS_EQ_RA_REL              Relative Right Ascension in a Special Scale
POS(,GAL)                           POS_GAL                        Galactic Coordinates and related quantities
POS(,GAL)_COSECB                    POS_GAL_COSEC-B              Cosecant of galactic latitude
POS(,GAL)_B                         POS_GAL_LAT                  Galactic Latitude
POS(,GAL)_L                         POS_GAL_LON                  Galactic Longitude
POS(GC,GAL)_R                       POS_GAL_GC                   Galactocentric Distance
POS(HELIO,GAL)_R                    POS_GAL_HC                   Heliocentric Distance
POS(GEO,GAL)_X                      POS_GAL_X                    X coordinate of object in Galactic Plane: x=r.cos(GLAT)cos(GLON)
POS(GEO,GAL)_Y                      POS_GAL_Y                    Y coordinate of object in Galactic Plane: y=r.cos(GLAT)sin(GLON)
POS(GEO,GAL)_Z                      POS_GAL_Z                    Z coordinate of object above Galactic Plane: z=r.sin(GLAT)
POS()                               POS_GENERAL                    Position in general
POS(GEO,)                           POS_GEO                        Geocentric Quantities
?                                   POS_GEO_ANGLE                Angle Of The Geocenter
POS(GEO,EQ)_DEC                     POS_GEO_DEC                  Geocentric declination
POS(GEO,EQ)_RA                      POS_GEO_RA                   Geocentric Right Ascension
POS(TOPO,AZEL)_HA                   POS_HA                         Hour Angle
POS(HELEC,CAR)                      POS_HC                         Heliocentric Coordinates
# Heliocentric ecliptic (HELEC) or Heliocetric equatorial (HELEQ) or other?
POS(HELIO,EC)_X                     POS_HC_X                     Heliocentric X
POS(HELIO,EC)_Y                     POS_HC_Y                     Heliocentric Y
POS(HELIO,EC)_Z                     POS_HC_Z                     Heliocentric Z
POS()_INC?                          POS_INCLIN                     Inclination angles
POS(EC,?)_INC                       POS_INCLIN_EC                Inclination Respect to the ecliptic
POS(HELIO,GAL)_INC                  POS_INCLIN_GP                Inclination Respect to the Galactic Plane
POS(,LOS)_INC                       POS_INCLIN_LOS               Inclination Respect to the Line Of Sight
POS(JUPITER,PROJ)                   POS_JOVIC                      Jovicentric Coordinates (Jupiter's Phenomena)
# Presumably a coordinate system in the plane of the sky along Jupiter's pole
POS(JUPITER,PROJ)_X                 POS_JOVIC_X                  Jovicentric X
POS(JUPITER,PROJ)_Y                 POS_JOVIC_Y                  Jovicentric Y
POS(,LAMBERT)                       POS_LAMBERT                    Coordinates in the Lambert Projection
POS(,LAMBERT)_R                     POS_LAMBERT_R                Lambert Polar Distance
POS(,LAMBERT)_X                     POS_LAMBERT_X                Lambert X Coordinate
POS(,LAMBERT)_Y                     POS_LAMBERT_Y                Lambert Y Coordinate
OBS_POS_LIMIT?                      POS_LIMIT                      Position Limit to an Observation
POS_LITERAL?                        POS_LITERAL                    Literal Alpha-Delta Identification of a Position
POS_LOCATION?                       POS_LOCATION                   Location of certain events not easily expressed in other categories
?                                   POS_MAP                        Quantity Measurement on a Contour Map
?                                   POS_OCCULT                     Quantity related to the lunar occultations
MUTUAL_OCCULT(L)_DIR                POS_OCCULT_DIR               Direction of lunar motion
MUTUAL_OCCULT(L)_                   POS_OCCULT_POS               Quantity related to the lunar occultations
MUTUAL_OCCULT(L)_SLOPE              POS_OCCULT_SLOPE             Lunar Slope
#in what coords?
POS(?)_OFFSET                       POS_OFFSET                     Positional offsets, usually a string
OBS_DISP_PARANG                     POS_PAR-ANG                    Parallactic Angle
POS()_R_PX                          POS_PARLX                      Parallax and related quantities
POS()_R_PX_DYN                      POS_PARLX_DYN                Dynamical Parallax
POS()_R_PX_PHOT                     POS_PARLX_PHOT               Photometric Parallax
POS()_R_PX_RADIO                    POS_PARLX_RADIO              Radio Parallax
POS()_R_PX_SPEC                     POS_PARLX_SPEC               Spectroscopic Parallax
POS()_R_PX_TRIG                     POS_PARLX_TRIG               Trigonometric Parallax
POS(OBJ)                            POS_PLANETARY                  Coordinates in a System Related Non-Jovian Planets
POS(DET)                            POS_PLATE                      Positions measured in photographic plates
POS(DET)_DIFF                       POS_PLATE_DIFF               Difference in position or separation between objects
POS(DET)_X                          POS_PLATE_X                  X Coordinate on a Plate
POS(DET)_Y                          POS_PLATE_Y                  Y Coordinate on a Plate
POS()_PM                            POS_PM                         Proper Motion (non-equatorial) and related quantities
POS()_PM_DIFF                       POS_PM_DIFF                  Difference In Proper Motion
POS()_PM_DISP                       POS_PM_DISP                    Mean/Dispersion in proper motions (typically in clusters)
POS()_PM                            POS_PM_NON-EQ                Proper Motion (non-equatorial)
POS()_PM_PA                         POS_PM_PA                    Polar Angle of Proper Motion Vector in a non-equatorial frame
POS()_PA                            POS_POS-ANG                    Position Angle (North through East) of a certain vector
POS()_PREC?                         POS_PRECESSION                 Precession
POS(OBJ)_R                          POS_RADIUS                     Radius Used To Calculate Other Quantity
POS()_SYS                           POS_REFERENCE-SYSTEM           Used Reference System
POS(,SG)                            POS_SG                         Super Galactic Coordinates
POS(,SG)_LAT                        POS_SG_LAT                   Supergalactic Latitude
POS(,SG)_LON                        POS_SG_LON                   Supergalactic Longitude
POS(,SG)_X                          POS_SG_X                     Supergalactic X coordinate
POS(,SG)_Y                          POS_SG_Y                     Supergalactic Y coordinate
POS(,SG)_Z                          POS_SG_Z                     Supergalactic Z coordinate
POS(,SOLAR)                         POS_SOLAR                      Solar Positions
POS(,SOLAR)_ELEV?                   POS_SOLAR_ELEVAT             Solar Elevation
POS(,SOLAR)_ELONG                   POS_SOLAR_ELONG              Solar Elongation
POS_TRANS_                          POS_TRANSF                     Transformation of a Position, like WCS constants
POS_TRANS_PARAM                     POS_TRANSF_PARAM               Parameter used in astrometric transformations, e.g. WCS constants
POS(,TP)                            POS_TANG-PLANE                 Tangent Plane Position or a system attached to an object
POS(TOPO,)                          POS_TOPO                       Topocentric Positions
POS(TOPO,EQ)_DEC                    POS_TOPO_DEC                 Topocentric Declination
POS(TOPO,EQ)_RA                     POS_TOPO_RA                  Topocentric right ascension
OBJ_POS_VAR                         POS_VAR                        Positional Variations
OBJ_POS_RATE                        POS_VAR_RATE                 Rate of Variation of positional quantities
POS(TOPO,)_ZD                       POS_ZD                         Zenith Distance and related quantities
POS(TOPO,)_ZD                       POS_ZD_MAIN                  Zenith Distance
POS(TOPO,)_ZD_RESID                 POS_ZD_RES                   Residual In Zenith Distance
DATA_RECORD?                        RECORD                           Record Number
POS_R_Z                             REDSHIFT                         Redshift
POS_R_Z_DIFF                        REDSHIFT_DIFF                  Difference in redshift (usually between companions or nearby objects)
POS(GAL)_R_Z                        REDSHIFT_GC                    Galactocentric Redshift
POS(HELIO)_R_Z                      REDSHIFT_HC                    Redshift (normally heliocentric)
POS_R_Z_PHOT                        REDSHIFT_PHOT                  Photometric Redshift
DATA_PROC_REDUCT                    REDUCT                           Quantities Associated with the Reduction Process
DATA_PROC_REG_R                     REDUCT_EXTR-RAD                Extraction Radius
DATA_PROC_REDUCT_METHOD             REDUCT_METHOD                  Reduction Method
DATA_PROC_REDUCT_PARAM              REDUCT_PARAM                   Reduction Parameter
DATA_PROC_REDUCT_TECH               REDUCT_TECH                    Reduction Technique
REFER_                              REFER                            References
REFER_BIBCODE                       REFER_BIBCODE                  Reference Bibliographic Code
REFER_CODE                          REFER_CODE                     References (or reference code)
REFER_TEXT                          REFER_TEXT                     Text related to a reference, may include author, journal, editor, publisher...
REFER_JOURNAL                       REFER_JOURN                    Journal/Publication
REFER_PAG                           REFER_PAGE                     Page Number
REFER_VOL                           REFER_VOL                      Volume
_REMARKS                            REMARKS                          Remark or Comments
SPEC                                SPECT                            Spectroscopy and related quantities
SPEC_BALMER_                        SPECT_BALMER                   Properties of hydrogen balmer series
SPEC_BALMER_DEC                     SPECT_BALMER_DEC             Balmer Decrement
SPEC_BALMER_JUMP                    SPECT_BALMER_JUMP            Balmer Jump
SPEC_CONT                           SPECT_CONTINUUM                Continuum Properties
SPEC_CONT_FLUXCOR                   SPECT_CONTINUUM_CORR-FACT     Continuum Correction Factor
SPEC_CONT_DEPTH                     SPECT_CONTINUUM_DEPTH        Continuum Depth
SPEC_CONT_INDICATOR?                SPECT_CONTINUUM_INDICATOR     Continuum Indicator
SPEC_CONT_PROP?                     SPECT_CONTINUUM_PROP         Continuum Properties
SPEC_DOPPLER_PAR?                   SPECT_DOPPLER-PAR              Doppler Parameter
SPEC_EMISSIVITY()                   SPECT_EMISSIVITY               Emissivity In A Certain Waveband
SPEC_FEATURE_EW                     SPECT_EQ-WIDTH                 Equivalent Width
SPEC_FEATURE                        SPECT_FEATURE                  Spectroscopic Feature properties
SPEC_FEATURE_PROP?                  SPECT_FEATURE_PROP           Spectroscopic Feature properties
SPEC_FEATURE_EW                     SPECT_FEATURE_WIDTH          Equivalent Width of a given Feature
SPEC_FLUX()                         SPECT_FLUX                     Flux, usually in a narrow spectral band
SPEC_FLUX()_NORM                    SPECT_FLUX_NORM              Normalized Flux, usually in a narrow spectral band
SPEC_FLUX()_NORM                    SPECT_FLUX_RATIO             Spectroscopic flux ratio
SPEC_FLUX(UV)_LINE                  SPECT_FLUX_UV                Spectroscopy line flux in the uv
SPEC_FLUX()                         SPECT_FLUX_VALUE             Flux, usually in a narrow spectral band
SPEC_                               SPECT_GENERAL                  Spectroscopy in general
SPEC_HR()                           SPECT_HARDNESS-RATIO           Hardness ratio usually in X-ray
SPEC_ID?                            SPECT_ID                       Spectral identification
SPEC_INDEX()                        SPECT_INDEX                    Spectroscopic index
SPEC_BANDPASS()                     SPECT_INDEX_BANDPASS         Spectroscopic index bandpass
SPEC_INDEX(HALPHA)                  SPECT_INDEX_HALPHA           H alpha spectroscopic index
SPEC_INDEX(HBETA)                   SPECT_INDEX_HBETA            H Beta spectroscopic index
SPEC_INDEX(HGAMMA)                  SPECT_INDEX_HGAMMA           H gamma spectroscopic index
SPEC_INDEX()                        SPECT_INDEX_MISC             Miscellaneous spectroscopic index
SPEC_FLUX_INT                       SPECT_INTEGRAL                 Integral spectrum
SPEC_INTENSITY()                    SPECT_INTENSITY                Spectral Intensity
SPEC_INTENSITY()                    SPECT_INTENSITY_ESTIMATED     Estimated Intensity
SPEC_INTENSITY()_DROP               SPECT_INTENSITY_FR-DROP      Intensity Drop Fraction
SPEC_INTENSITY(HBETA)_NORM          SPECT_INTENSITY_HBETA-NORM     Hbeta Normalized Intensity
SPEC_INTENSITY()_COUNT              SPECT_INTENSITY_INST-UNIT     Intensity In Instrumental Units
SPEC_INTENSITY()                    SPECT_INTENSITY_MAIN         Spectral Intensity
SPEC_INTENSITY()_NORM               SPECT_INTENSITY_RATIO        Intensity Ratio
SPEC_INTENSITY()_NORM               SPECT_INTENSITY_REL          Relative Intensity
SPEC_LINE_                          SPECT_LINE                     Spectral Line Properties
SPEC_LINE_WIDTH_BROAD?              SPECT_LINE_BROADENING        Line Broadening
SPEC_LINE_LAMBDA                    SPECT_LINE_CENT              Line Central Position
SPEC_LINE_DEPTH?                    SPECT_LINE_DEPTH             Line Depth
SPEC_LINE_DEPTH_DIFF                SPECT_LINE_DEPTH_DIFF      Difference In Line Depth
SPEC_LINE_DEPTH?                    SPECT_LINE_DEPTH_VALUE     Line Depth
SPEC_LINE_ENERGY                    SPECT_LINE_ENERGY            Line Energy
SPEC_LINE_FREQ                      SPECT_LINE_FREQUENCY         Line Frequency (usually in radio)
SPEC_LINE_FREQ_DIFF                 SPECT_LINE_DIFF-FREQ         Differential frequency between two lines (usually in radio)
SPEC_LINE_WIDTH_FWHM                SPECT_LINE_FWHM              Line Full Width Half Maximum (FWHM)
SPEC_LINE_ID                        SPECT_LINE_ID                Line Identification
SPEC_LINE_INTENSITY                 SPECT_LINE_INTENSITY         Line Intensity
SPEC_LINE_MOMENT                    SPECT_LINE_MOMENT            Line Moment
SPEC_LINE_INTENSITY_RATIO           SPECT_LINE_RATIO             Line Ratio
SPEC_LINE_STRENGTH                  SPECT_LINE_STRENGTH          Line Strength
SPEC_LINE_TEMP                      SPECT_LINE_TEMP              Line temperature
SPEC_LINE_WIDTH                     SPECT_LINE_WIDTH             Line Width
OBJ_CLASS_LUM                       SPECT_LUM-CLASS                Luminosity Classification
SPEC_LUM()_DLAMBDA                  SPECT_LUM/WVLNGTH-INT          Luminosity per Wavelength Interval
SRC_LUM()                           SPECT_LUMINOSITY               Monochromatic Luminosity
SPEC_INTENSITY()_NORM               SPECT_NORMALIZED               Normalized Spectrum
OBJ_CLASS_SPEC_PEC                  SPECT_PECUL                    Spectral Peculiarities
SPEC_POWER?                         SPECT_POWER                    Spectral Power
OBS_COV_BAND_RANGE                  SPECT_RANGE                    Spectral Range
OBS_COV_BAND_RES                    SPECT_RESOLUTION               Spectral Resolution
OBS_SN                              SPECT_S/N                      Spectrum Signal To Noise Ratio
OBS_EXP_BAND                        SPECT_SENSITIVITY              Spectral sensitivity
SPEC_INDEX_HR_SOFTNESS              SPECT_SOFTNESS-RATIO           Softness ratio usual in x ray
SPEC_INDEX_POS                      SPECT_SP+INDEX                 Spectral Index (positive alpha)
SPEC_INDEX_NEG                      SPECT_SP-INDEX                 Spectral Index (negative alpha)
SPEC_STARK?                         SPECT_STARK                    Stark effect related quantities
SPEC_SUN?                           SPECT_SUN                      Solar Spectrum
OBJ_CLASS_SPEC                      SPECT_TYPE                     Spectrum Classification
OBJ_CLASS_SPEC                      SPECT_TYPE_GENERAL           Spectrum Classification
OBJ_CLASS_SPEC_MK                   SPECT_TYPE_MK                MK Spectral Classification
OBJ_CLASS_SPEC_RADIO                SPECT_TYPE_RADIO             Radio Spectral Type
SPEC_LINE_VEL                       SPECT_VELOC                    Velocity (associated with lines)
SPEC_LINE_VEL                       SPECT_VELOC_VALUE            Velocity (associated with lines)
SPEC_LINE_WIDTH_VEL                 SPECT_VELOC_WIDTH            Velocity width
SPEC_LINE_LAMBDA                    SPECT_WAVELENGTH               Wavelength (associated to lines)
SPEC_LINE_LAMBDA                    SPECT_WAVELENGTH_CENTRAL     Central wavelength
SPEC_LINE_LAMBDA_DIFF               SPECT_WAVELENGTH_DIFF        Difference in Wavelength
SPEC_LINE_LAMBDA?                   SPECT_WAVELENGTH_MISC        Wavelength (associated to lines)
_STAT_                              STAT                             Statistical Properties
_STAT_REJPC                         STAT_%REJECT                   Percent of Rejection
SAMPLE_STAT_COMPLETENESS            STAT_COMPLETENESS              Degree of Completeness of a Sample
# Concepts: Population, sample
SAMPLE_STAT_CORR                    STAT_CORRELATION               Correlation
SAMPLE_STAT_COVAR                   STAT_COVAR                     Statistical covariance parameter
_STAT_LIKELIHOOD                    STAT_LIKELIHOOD                Maximum Likelihood of existence or occurence
_STAT_LIKERATIO                     STAT_LIKELIHOOD-RATIO          Likelihood Ratio
_STAT_MEAN                          STAT_MEAN                      Statistics Mean Value
_STAT_MEDIAN                        STAT_MEDIAN                    Statistics Median Value
_STAT_DF                            STAT_N-DOF                     Degrees of Freedom
_STAT_PARAM?                        STAT_PARAM                     Statistic Parameter or Factor
_STAT_PROB                          STAT_PROBABILITY               Probability
?                                   STAT_PROP                      Statistical Properties
_STAT_SAMPFAC                       STAT_SAMP-FACTOR               Sampling Factor
_STAT_SIGNIF                        STAT_SIGNIFICANCE              Statistical Significance
_STAT_SD                            STAT_STDEV                     Statistical standard deviation (square root of the variance)
_STAT_VAR                           STAT_VAR                       Statistical variance (squared standard deviation) or second moment
OBS_TEL                             TEL                              Telescopes
OBS_TEL_APERTURE                    TEL_APERTURE                   Telescope Aperture
OBS_TEL_FOCLEN                      TEL_FOCAL-LENGTH               Focal Length
OBS_TEL_ID                          TEL_ID                         Telescope Identification
TIME                                TIME                             Time and related Quantities
OBJ_AGE                             TIME_AGE                       Age
OBJ_TCROSSING                       TIME_CROSSING                  Crossing Time
OBJ_CYCLE                           TIME_CYCLE                     Cycle number of a variable object.
TIME_DATE                           TIME_DATE                      Date (Julian Date or Heliocentric Julian date)
OBJ_TDELAY                          TIME_DELAY                     Time Delay
TIME_DIFF                           TIME_DIFF                      Time Difference O-C Residual
OBJ_DPDT                            TIME_DP/DT                     Period Rate Of Change
TIME_EPOCH                          TIME_EPOCH                     Epoch
TIME_EQUINOX                        TIME_EQUINOX                   Equinox
TIME_EVOL?                          TIME_EVOLUTION                 Evolution Time
OBS_EXPTIME                         TIME_EXPTIME                   Exposure Time
OBS_TIME_INTVL?                     TIME_INTERVAL                  Time Interval
?                                   TIME_LIMIT                     Time Limit
TIME                                TIME_MISC                      Time in general
OBJ_ORB_PERIOD                      TIME_PERIOD                    Period
OBJ_ORB_PHASE                       TIME_PHASE                     Phase (in the context of periodic variable objects)
TIME_RATE                           TIME_RATE                      Rate Of Certain Phenomenon
TIME_RELAX                          TIME_RELAXATION                Relaxation Time
OBS_COV_TIME_RES                    TIME_RESOLUTION                Time resolution
TIME_SCALE                          TIME_SCALE                     Time Scale
TIME_ZONE                           TIME_ZONE                      Time Zone
_UNIT                               UNITS                            Units in which a quantity is measured
.                                   VAR                              Quantities related to variable objects
PHOT_VAR_AMPL                       VAR_AMPLITUDE                  Amplitude of variation and related quantities
PHOT_VAR_AMPL_RATIO                 VAR_AMPLITUDE_RATIO          Amplitude Ratio
PHOT_VAL_AMPL                       VAR_AMPLITUDE_VALUE          Amplitude of variation
OBJ_CLASS_VAR                       VAR_CLASS                      Type of variability
OBJ_ROT_DFDT2_BARY                  VAR_DF/DT2                     2nd time derivative of barycentric rotation frequency in seconds
OBJ_ROT_DFDT3_BARY                  VAR_DF/DT3                     3rd time derivative of barycentric rotation frequency in seconds
OBJ_EPH_ECLIPSE_CYCLE               VAR_ECL-CYC-N                  Eclipse Cycle Number
PHOT_VAR_FRAC?                      VAR_FRACT-LIGHT                Fraction Light
PHOT_VAR_INDEX                      VAR_INDEX                      Variability Index
PHOT_VAR_DROP                       VAR_LIGHT-DROP                 Light Drop
PHOT_MAG()_VAR_RANGE                VAR_MAG-RANGE                  Magnitude Range
?                                   VAR_MEAN                       Quantity at stage of mean
?                                   VAR_MODEL-FIT                  Variability Fit Parameter
PHOT_VAR_PERIOD                     VAR_PERIOD                     Period of Variability and related quantities
PHOT_VAR_PERIOD                     VAR_PERIOD_VAR               Period Variations
PHOT_VAR_PRIMIN                     VAR_PRIM-MIN                   Primary Minimum Importance
PHOT_VAR_PROB                       VAR_PROBABILITY                Probability of Variability
PHOT_VAR_PULSE                      VAR_PULSE                      Quantities related to pulses (pulsars)
PHOT_VAR_PULSE_EW                   VAR_PULSE_EQ-WIDTH           Pulse Equivalent Width
PHOT_VAR_PULSE_WIDTH                VAR_PULSE_WIDTH              Pulse Width
PHOT_VAR_RADIAL                     VAR_RAD-OSCILL                 Radial Oscillation Parameter
PHOT_VAR_FREQ                       VAR_RRLYRA-FREQ                Frequency Of RR Lyrae
# Why specifically RR Lyr?
PHOT_VAR_SECMIN                     VAR_SEC-MIN                    Secondary Minimum Importance
OBJ_VEL                             VELOC                            Velocity
OBJ_VEL_BARY                        VELOC_BARYCENTER               Barycenter Velocity
OBJ_VEL_CM                          VELOC_CM                       Velocity Refered to a Co-Moving System
OBJ_VEL_CM_X                        VELOC_CM_X                   Comoving Velocity Along X Eastward
OBJ_VEL_CM_Y                        VELOC_CM_Y                   Comoving Velocity Along Y Northward
OBJ_VEL_CM_Z                        VELOC_CM_Z                   Comoving Velocity Along the Line of Sight
OBJ_VEL(CMB)_R                      VELOC_CMB                      Radial Velocity respect to the 3K CMB
OBJ_VEL_CORR                        VELOC_CORR                     Velocity Correction
OBJ_VEL_DIFF                        VELOC_DIFF                     Velocity Difference
OBJ_VEL_DISP                        VELOC_DISP                     Velocity Dispersion
OBJ_VEL_ESCAPE                      VELOC_ESCAPE                   Escape Velocity
OBJ_VEL_EXPANSION                   VELOC_EXPANSION                Expansion Velocity
OBJ_VEL(GAL)                        VELOC_GAL                      Space Velocity In Galactic Coordinates
OBJ_VEL(GAL)_PHI                    VELOC_GAL_PHI                Space Velocity In Galactic Coordinate Phi Component
OBJ_VEL(GAL)_RHO                    VELOC_GAL_RHO                Space Velocity In Galactic Coordinate Rho Component
OBJ_VEL(GAL)_U                      VELOC_GAL_U                  Space Velocity In Galactic Coordinate U Component
OBJ_VEL(GAL)_V                      VELOC_GAL_V                  Space Velocity In Galactic Coordinate V Component
OBJ_VEL(GAL)_W                      VELOC_GAL_W                  Space Velocity In Galactic Coordinate W Component
OBJ_VEL(GAL)_R                      VELOC_GC                       Galactocentric Radial Velocity
OBJ_VEL(GEOC)_R                     VELOC_GEOC                     Geocentric Radial Velocity
OBJ_VEL(HELIO)_R                    VELOC_HC                       Heliocentric Radial Velocity
OBJ_VEL(LG)_R                       VELOC_LG                       Local Group Radial Velocity
OBJ_VEL(LSR)_R                      VELOC_LSR                      Radial Velocity Respect to the Local Standard of Rest
OBJ_VEL_MAX                         VELOC_MAX                      Maximum or Terminal Velocity
OBJ_VEL_MEAN                        VELOC_MEAN                     Mean Velocity
MED_MATTER_VEL_MICROTURB            VELOC_MICRO-TURB               Microturbulence Velocity
OBJ_VEL                             VELOC_MISC                     Velocity in general
OBJ_VEL(OBS)                        VELOC_OBS                      Observed velocity (without corrections)
OBJ_VEL_OCCULT                      VELOC_OCCULT                   Occultation Velocity
OBJ_VEL_ORB                         VELOC_ORBIT                    Orbital Velocity
OBJ_VEL_PEC                         VELOC_PECULIAR                 Peculiar Velocity
OBJ_VEL_PREENTRY                    VELOC_PRE-ENTRY                Pre-Entry Velocity (meteorites)
OBJ_VEL_PULSAT                      VELOC_PULSAT                   Pulsation Velocity
OBJ_VEL_RANGE                       VELOC_RANGE                    Velocity Range
OBJ_VREL                            VELOC_RELAT                    Relative Velocity
OBJ_VEL_RESID                       VELOC_RESID                    Residual velocity (any component or system)
OBJ_VEL_RMS                         VELOC_RMS                      Velocity RMS
OBJ_VROT                            VELOC_ROTAT                    Rotational Velocity
OBJ_VEL                             VELOC_SPACE                    Space Velocity
OBJ_VEL_X                           VELOC_SPACE_X                Space Velocity X Component
OBJ_VEL_Y                           VELOC_SPACE_Y                Space Velocity Y Component
OBJ_VEL_Z                           VELOC_SPACE_Z                Space Velocity Z Component
OBJ_VEL_R_SYSTEMIC                  VELOC_SYST                     Systemic Velocity
OBJ_VEL(HELIO)_R                    VELOC_SYST_HC                Heliocentric Systemic Velocity
OBJ_VEL_R_SYSTEMIC                  VELOC_SYST_MISC              Systemic Velocity
OBJ_VEL_TANG                        VELOC_TANG                     Tangential Velocities
OBJ_VEL_TANG_GAL                    VELOC_TANG_GAL               Tangential Velocity in Galactic Frame
OBJ_VEL_TANG                        VELOC_TANG_MISC              Tangential Velocity
OBJ_VEL_TANG_PEC                    VELOC_TANG_PEC               Peculiar Tangential Velocity
OBJ_VEL_TOT                         VELOC_TOTAL                    Total Velocity
OBJ_WIND_VEL                        VELOC_WIND                     Wind Velocity
_WEIGHT                             WEIGHT                           Statistical Weight Associated to Data Fits
PHOT_BAND_ID                      -                               Band ID
PHOT_COL(*PHOT_SYS,*PHOT_COL_ID)  PHOT_INDX                      Photometric index (usually in narrow bands)
PHOT_FLUX(*PHOT_BAND_ID)              - 
PHOT_MAG(*PHOT_SYS_ID,*PHOT_BAND_ID) -



Appendix 2:

In X-ray land, Dean Hinshaw and I made a start on a list of objects we use.
I've tried to group related concepts as much as possible.

*** Types of data object:

UCD/PCD          Dataset Name

DATA_EVTLIST     EVENT LISTS
DATA_IMAGE2D     DATA HISTOGRAMS: (spatial) 2D-IMAGES (with nulls)
DATA_HIST_ENERGY DATA HISTOGRAMS: (energy) SPECTRA
DATA_HIST_TIME   DATA HISTOGRAMS: (temporal) LIGHT CURVES
OBS_DATA         OBSERVATION PARAMETERS
                 COORDINATES (Spatial, Temporal, Gain, Dispersion-relation, General)
OBS_COV_TIME     COVERAGE - Temporal (GTIs, TSTART family)
OBS_COV_POS      COVERAGE - Spatial (Regions, RA_NOM family, Source/Background pairs)
OBS_COV_INST_POS COVERAGE:  Spatial (instrumental)  = BAD PIXEL MAPS
OBS_COV          COVERAGE - general filters, Data Subspace
SAMPLE_CAT       SOURCE LISTS (see regions)
INST_GEOM        INSTRUMENT/TELESCOPE GEOMETRY; BORESIGHT
OBS_SITE_ORBIT   ORBIT EPHEMERIS
OBS_ASOL         ASPECT SOLUTION
OBS_EXP_POS      EXPOSURE MAPS  (units of [s], units of [erg cm^-2 s^-1/count s^-1])
OBS_EXP_ENERGY   SENSITIVITY MAP: vs Energy (ARF, Filter transmission)
OBS_EXP_TIME     SENSITIVITY MAP: vs Time (dead time correction, XMM EXPOSUn)
OBS_EXP_POS_INST SENSITIVITY MAP: vs Position (QE map, VIGNETTING)
OBS_EXP_POS_VIG  
OBS_EXP_POS_BIAS BIAS MAPS
OBS_RESP_POS    KERNELS (spatial): PSF;  GRADE/PATTERN
OBS_RESP_ENERGY KERNELS (energy): RMFs, LSFs
OBS_RESP_TIME   KERNELS (temporal): TIMEDEL
OBS_RESP_ENERGY_GAIN      GAIN MAPS (gain is a simplified RMF)
OBS_RESP_ENERGY_GAIN_TIME GAIN CAL (versus time)
OBS_HK_TIME      HOUSEKEEPING: Mission Timeline, engineering data
        [includes: Commanded sc/instrument parameters; 
                   measured sc/instrument parameters;
                   measured environmental information
                   calculated (e.g. sun angle) environmental info]


Keywords in EVENT lists (in progress) ----


UCD/PCD                           FITS 

DATA_IMAGE_DIM                    NAXIS                Image dimension
DATA_ITEM_TYPE                    TFORM                Data item datatype
DATA_ITEM_NAME                    TTYPE                Data item name
OBS_DATE                          DATE-OBS             Start Observation date as string
OBS_DATE:2                        TIME-OBS   (ROSAT, now obsolete)
OBS_DATE_END                      DATE-END             End of obs date as string
OBS_DATE_END:2                    TIME-END   (Rosat, now obsolete)
DATA_PROV_ORIGIN                  ORIGIN               
DATA_PROV_CREATOR                 CREATOR
OBS_COV_TIME_FRAME               TIMESYS
OBS_COV_TIME_ORIGIN_MJD          MJDREF
OBS_COV_TIME_ORIGIN_MJD:1        MJDREFI  (Rosat)
OBS_COV_TIME_ORIGIN_MJD:2        MJDREFF  (Rosat)
OBS_COV_TIME_INST_DIFF           TIMEZERO		Clock corr
OBS_COV_TIME_INST_UNIT           TIMEUNIT
OBS_COV_TIME_INST_START          TSTART
OBS_COV_TIME_INST_STOP           TSTOP
OBS_COV_TIME_START_MJD           MJD-OBS  (Rosat)
OBS_MISSION                       MISSION
OBS_TEL                           TELESCOP
OBS_INST_ID                       INSTRUME
OBS_ID                            OBS_ID
OBS_ID2                           SEQ_NUM
DATA_PROC_SYS_VER                 ASCDSVER, PROC_SYS
DATA_PROC_VER                     REVISION
DATA_CONTENT_CLASS_ORG            HDUCLASS
DATA_CONTENT_CLASS1               HDUCLAS1
DATA_CONTENT_CLASS2               HDUCLAS2
DATA_CONTENT_CLASS3               HDUCLAS3
DATA_FILE_DATE                    DATE
OBS_COV_TIME_ERR_ABS             TIERABSO
OBS_COV_TIME_ERR_REL             TIERRELA
OBS_COV_TIME_BIN_TYPE            TIMEPIXR           Begin middle or end of bin
OBS_COV_TIME_RES                 TIMEDEL
OBS_DET_ID                       DETNAM
OBS_DISP_ID                      GRATING
OBS_TARGET_ID                    OBJECT
OBS_TITLE                        TITLE
OBS_AUTHOR_CODE                  OBSERVER
OBS_DET_POS_ORIGIN_X             SIM_X              Offset of detector origin from opt axis
OBS_DET_POS_ORIGIN_Y             SIM_Y              Offset of detector origin from opt axis
OBS_DET_POS_ORIGIN_Z             SIM_Z              Offset of detector origin from opt axis
OBS_DET_DEFOCUS                  DEFOCUS  mm
OBS_TEL_FOCLEN                   FOC_LEN
OBS_TEL_MODE                     OBS_MODE
OBS_DET_MODE                     DATAMODE
OBS_DET_READ_MODE                READMODE
OBS_DET_READ_CYCLE               CYCLE         For obs split into different configs
OBS_POS(,EQ)_RA                  RA_NOM 
OBS_POS(,EQ)_DEC                 DEC_NOM
OBS_DET_ROLL                     ROLL_NOM      Nominal rotation of detector
OBJ_POS(,EQ)_RA                  RA_TARG
OBJ_POS(,EQ)_DEC                 DEC_TARG
TIME_EQUINOX                     EQUINOX                   Equinox
POS_FRAME                        RADECSYS
DATA_CLASS                       DATACLAS
OBS_EXPTIME                      ONTIME
OBS_EXPTIME_CORRECTED            LIVETIME
OBS_EXPTIME_CORRECTED            EXPOSURE
OBS_EXPTIME_CORRECTION           DTCORR
OBS_ASOL_TYPE                    ASPTYPE
DATA_HISTORY                     HISTORY
OBS_COV_TIME_INST_RAW_START:2    START_MNF
OBS_COV_TIME_INST_RAW_START:1    START_MJF
OBS_COV_TIME_INST_RAW_STOP:1     STOP_MJF
OBS_COV_TIME_INST_RAW_STOP:2     STOP_MNF
EVENT_TIME_INST                  TIME
OBS_INST_DET_ID                  CCD_ID
OBS_INST_DET_CCD_NODE            NODE_ID
OBS_EXPOSURE_NO                  EXP_NO
EVENT_POS(INST,CHIP)_X           CHIPX
EVENT_POS(INST,CHIP)_Y           CHIPY
EVENT_POS(INST,DET)_X            DETX
EVENT_POS(INST,DET)_Y            DETY
EVENT_POS(INST,TDET)_X           TDETX
EVENT_POS(INST,TDET)_Y           TDETY
EVENT_POS(INST,SKY)_X            X
EVENT_POS(INST,SKY)_Y            Y
EVENT_ENERGY_INST_PIX            PHAS    # per pixel
EVENT_ENERGY_INST                PHA
EVENT_ENERGY                     ENERGY
EVENT_ENERGY_INST_CORR           PI
EVENT_PATTERN_FLT                FLTGRADE
EVENT_PATTERN_ASCA               GRADE
EVENT_QUALITY_MASK               STATUS
DATA_CAL_FILE_ENERGY_SCALE       GAINFILE
DATA_CAL_FILE_PATTERN            GRDFILE
DATA_CAL_FILE_BADPIX             BPIXFILE
DATA_CAL_FILE_BIAS_DET(*ID)      BIASFILid
DATA_TLM_VERSION                 FSW_VERS
OBS_COV_TIME_INST_DET(*ID)_           GTIid
OBS_COV_TIME_INST_DET(*ID)_START      GTIid:START
OBS_COV_TIME_INST_DET(*ID)_STOP       GTIid:STOP
OBS_COV_PATTERN                  DSVAL(GRADE)
OBS_COV_TIME_CLOCKAPP_Q          CLOCKAPP
OBS_POS(,EQ)_COORD_RA            TCTYPn = RA---TAN
OBS_POS(,EQ)_COORD_DEC           TCTYPn = DEC--TAN
OBS_POS(,EQ)_COORD_SCALE         TCDLTn
OBS_POS(,EQ)_COORD_REF           TCRVLn
OBS_POS(,EQ)_COORD_PIX           TCRPXn
OBS_POS(,DET)_COORD_THETA        TCTYPn =, TCNAM=THETA
OBS_POS(,DET)_COORD_PHI          TCTYPn =, TCNAM=PHI
OBS_POS(,DET)_COORD_SCALE etc

ROSAT file:

DATA_FORMAT_DATE                  RDF_DATE  (Rosat)
DATA_FORMAT_VER                   RDF_VERS
OBS_FILTER                        FILTER
OBS_ID2                           ROR_NUM
OBS_DET_MODE                      SETUPID
OBS_ID_SUBID                      OBI_NUM
OBS_COV_TIME_INST_START           SCSEQBEG 
OBS_COV_TIME_INST_STOP            SCSEQEND
OBS_ID_NSUBID                     NUM_OBIS
OBS_COV_TIME_CLOCKAPP_S           CLOCKCOR
DATA_EVENT_REJ_                   EXTNAME = REJEVT



From dide at discovery.saclay.cea.fr  Thu Mar 27 02:36:30 2003
From: dide at discovery.saclay.cea.fr (DIDELON Pierre)
Date: Thu, 27 Mar 2003 11:36:30 +0100 (MET)
Subject: UCDs status and perspectives
Message-ID: <200303271036.h2RAaUd29807@rosetta.saclay.cea.fr>

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Hi Anita, Ray et al,

I globally and fully agree with all your points and comments,
the most important one is to use the only available quite exhaustive
metadata (UCD) as a crucial use case to elaborate a more flexible
and sophisticated schema.
I am impressed by Ray's willingness to define a metadata model
to refactored the domain, and I am waiting it with great eagerness.
I was thinking about such a process and the most difficult part 
for me is the mechanism to keep a link to UCD and continuing to
support them.
I tried to formalize the possible inter-relations in the attached
UML diag, (triangle at the beginning of a line is inheritance,
others lines are relations; assoc,agreg....).
Several question araise already in my mind even at this very simple level :
- Does Descriptor and Group... need to inheritate from Atom and Descriptor,
or is the association use/is_part_of sufficient? In other words, do we
need several level of composition? Group of group of Descriptors?...
- is the relation UCD/PAD formally needed?
- Which is the link between the actual UCD_Tree and all the possible
and usefull descriptors associations?

cheers,
pierre

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From jcm at head-cfa.cfa.harvard.edu  Sun Mar 30 16:29:05 2003
From: jcm at head-cfa.cfa.harvard.edu (jcm at head-cfa.cfa.harvard.edu)
Date: Sun, 30 Mar 2003 19:29:05 -0500 (EST)
Subject: UCD Status and Perspectives
Message-ID: <200303310029.h2V0T5M29580@urania.cfa.harvard.edu>


Patricio,
 I realize I never followed up your message of Mar 19. For the record,
what I had in mind with my spectral index example, I had in
mind finding the sources in a subsample and calculating what their
4100A fluxes are, for instance to get a sample for an observing proposal
of the 10 brighest northern objects of a particular class, brightest by
4100A flux. And I want to do it even including objects whose 4100A flux
is not actually known, but can be guessed from other published fluxes assuming
an SED.        
 In general, the existing UCDs are great for getting general information but
not for knowing exactly what you have, that was the broader point. A side point
from this example is that I think the VO will need to allow users to specify
certain assumptions to provide a context for queries (I'm looking for quasars,
and here's what you can assume about quasars - e.g. a typical SED - so that you
can handle my query even in cases where the information is incomplete... a bit
like a Bayesian prior in spirit, I guess).


  Regards, Jonathan


From Marco.Leoni at eso.org  Fri Mar  7 08:00:15 2003
From: Marco.Leoni at eso.org (Marco Leoni)
Date: Fri, 07 Mar 2003 17:00:15 +0100
Subject: [Fwd: RE: UCDs - repost]
Message-ID: <3E68C20F.7020700@eso.org>



-------- Original Message --------
Subject: RE: UCDs - repost
Date: Fri, 7 Mar 2003 09:25:19 -0500
From: "Wil O'Mullane" <womullan at skysrv.pha.jhu.edu>
To: registry at ivoa.net



I note in your paper you mention not being able to express functions in an Ontology.
Many years ago I worked with Ontoloigua and KIF(Knowledge Interchange Format)
this indeed allows one to express functions on numbers .
http://logic.stanford.edu/kif/kif.html

Of course KIF is lisp (Lots of Incomprehensilble Silly Brackets indeed) based and not very pretty .

Still I see KSL have now extended Ontalingua in to the web world and suggest provideing it as a Server... it may bear looking at.

Perhaps this has already been explored ..

wil
> 
>   Hello all,
> 
>   Maybe some of you have not subscribed to the 
> ucd at ivoa.net list, but might have interest in
> reading the paper I posted there:
> 
> http://www.ivoa.net/forum/ucd/0001.htm
> 
>   Sorry for those who received this info twice.
> 
> Sebastien.
> -- 
>     _______
>    /  ~   /, Sebastien Derriere   mailto:derriere at astro.u-strasbg.fr
>   / ~~~~ //  Observatoire de Strasbourg    Phone +33 (0) 390 242 444
>  /______//   11, rue de l'universite     Telefax +33 (0) 390 242 417
> (______(/    F-67000 Strasbourg  France


----- End forwarded message -----

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From amsr at jb.man.ac.uk  Mon Mar 17 08:03:55 2003
From: amsr at jb.man.ac.uk (Anita Richards)
Date: Mon, 17 Mar 2003 16:03:55 +0000 (GMT)
Subject: UCD Status and Perscpectives
Message-ID: <Pine.GSO.4.53.0303171536240.11593@aten>



Sebastien's 'UCD: Status and Perspectives' gives a very clear summary of
the recent discussions, responding on the basis of the considerable
experience of CDS. Thanks very much - I actually enjoyed reading it,
especially the ontology section. It suggests to me some issues which it
would help if we made decisions on, or at least reached a working
agreement for the immediate future. Maybe Sebastien (or anyone) could
suggest what is most urgently needed for discussion at the IVOA registry
meeting Wednesday 19 Mar - is anyone planning a presentation? This is what
occurs to me:

1) Registries needs UCDs.

  'Status and Perspectives'
 discusses relevant issues in '3. UCDs and data models'.  We need
 general UCDs which describe an entire data set ("Header metadata"),
 e.g. for which wavelength regime (Radio, IR, Optical etc) - where
 such currently UCDs exist, they are often parts or parents, rather
 than ones which are instantiated. See e.g.

   [[http://www.stsci.edu/~hanisch/NVO/ResourceServiceMetadataV6.doc][Bob
   Hanisch ResourceServiceMetadataV6.doc]]
or

[[http://www.stsci.edu/~hanisch/NVO/ResourceServiceMetadataV6.pdf][ResourceServiceMetadataV6.pdf]]
   and

[[http://wiki.astrogrid.org/bin/view/Astrogrid/RegistrySchema][AstroGrid
   draft registry schema]]

We also need a means to associate header data with column labels,
e.g. if all data in one catalogue is at 1.4 GHz  and another at
1.6 GHz this currently has two separate column UCDs,
PHOT_FLUX_RADIO_1.4G and PHOT_FLUX_RADIO_1.6G - dozens of UCDs in
all.  Using the atom idea across the header and the columns, this
could be achieved using one column UCD PHOT_FLUX, and header UCDs for
the wavelength regime (radio) and the nominal frequency.  This does
require that we evaluate the data corresponding to UCDs, see below.

2) Evaluating data identified by UCDs

Many people think of UCDs as primarily for selection of catalogues for
a human to then view the contents.  This is their primary funtion as
far as the Registry is concerned, but for actually executing queries
we need to compare values within cagtalogues and possibly associate
the results with a new UCD (e.g. compare flux densities to derive a
colour).

Until recently, UCDs were only evaluated routinely (e.g. via Vizier)
in one of the most difficult cases - coordinate conversion.
Otherwise, the user said 'give me a list of catalogues containing
information about x' and the service converted x into UCDs and
returned a list of catalogues containing columns corresponding to x.
This is now extended to photometry but only for special formats (see
above or the AVO demo).  We now need UCDs which can enable selection
via evaluating UCDs, e.g. if I want flux density measurements between
1.4 and 1.6 GHz I should be able to access data at 1.5 GHz too, via
the registry search seeing there is a catalogue containing radio flux
densities, and the query execution finding OBS_FREQUENCY 1.5 GHz - in
the header, or as a column heading for a collection of measurements at
a range of frequencies, as well as a column PHOT_FLUX.

This may be a problem where one UCD describes several columns
e.g. TIME_DATE for the start and stop of observations, but we want to
evaluate both e.g. for error bars on a proper motion measurement.  Or
do we just need an algorithm which says 'if there are two TIME_DATEs
and they are different, take the difference'?

3. Who reads UCDs?

The document asks 'how do I find the proper UCD to decribe my data
set'. At present, this is done automatically if you are someone
contributing a 'simple' table e.g. out of a paper; the average
astronomer is not _forced_ to be exposed to UCDs, and a user doing a
search certainly isn't (although they might want to use them
directly).  Data providers of major archives may need to investigate
them to check they are allocated correctly or suggest new ones, as do
VO workers. Thus they should be reasonably human-readable and
available for anyone, but not restricted to the lowest common
denominator of astronomical understanding.

We could increase the present number ten or even 100 fold (still
<10^5) - I am not saying we should, but we need to be afraid of it.
For example, if I am using the SED tool in Aladin, I really do not
want to know that an optical data set has UCDs for photometric zero
point and colour corrections (although an optical astronomer might and
I had to learn...) but fortunately the Aladin prototype SED tool knows
how to use these to plot magnitudes in Jy.  Conversely an optical
astronomer does not want to know parameters associated with radio
visibility data but if s/he wants to extract an off-centre image at a
certain resolution from the MERLIN archive, they need the extraction
tool to know about baseline lengths, visibility integration times
etc. to chose a data set with an appropriate field of view and
resolution.

Thus, completeness of UCDs for their purpose is more important than
economy, and in fact the savings in going to an atomic structure would
probably mean we could add UCDs for specific errors, and remove the
degeneracy of things currently under 'TIME_DATE' or 'NUMBER' etc., without
making UCDs unmanagable. As the document says, the creation of new UCDs
should certainly be restricted to defined bodies (e.g. via a central
monitoring panel) to avoid duplication and maintain consistency at a
functional level.  This probably means UCDs will proliferate slowly,
acquire some clumsy ones, and then be pruned or refactored over a cycle of
months or years.

Best wishes

Anita

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Dr. Anita M. S. Richards, AVO Astronomer
MERLIN/VLBI National Facility, University of Manchester,
Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL, U.K.
tel +44 (0)1477 572683 (direct); 571321 (switchboard); 571618 (fax).


From pfo at star.le.ac.uk  Tue Mar 18 05:08:39 2003
From: pfo at star.le.ac.uk (Patricio F. Ortiz)
Date: Tue, 18 Mar 2003 13:08:39 +0000 (GMT)
Subject: UCD Status and Perscpectives
In-Reply-To: <Pine.GSO.4.53.0303171536240.11593@aten>
Message-ID: <Pine.GSO.4.44L0.0303181304590.28327-100000@sparky.star.le.ac.uk>

Hi Anita,

as a reflexion on your thought I wrote the following lines, which I think
may be relevant. I must add that I agree with your points nearly 100% :-)

Cheers,

Patricio

UCDs for the photometric and time domain.


At nearly 5 years since the beginning of the work on UCDs a number
of things have evolved which make it worth re-thinking how these two
observation-related quantities can be represented for the new usages
broght by the advent of the IVO and the possible usages by both human
users or machine users (eg registries).

Both of these variables can be seen as continuous, and one single
observation will cover a certain range in wavelength (frequency) and a
certain range in time.

Historically, the wavelength domain has been split in "bands" by the use of
photometric systems and observing bands in the different domains. UCDs
tried to adjust to this scheme as it is useful to find comparable
quantities in a simple datamining model. What was done was very similar to
have POS_EQ_RA_MAIN_1H, POS_EQ_RA_MAIN_2H... The position in the sky, of
course, was never constrained by instrumental settings and systems.

Today though, we have seen the broad possibilities of searching in
archived data and this scheme attached to UCDs can hardly cope with some
of the newly imposed requirements. The problem is not to add more UCDs to
the system, as that was seen as a clear possibility since the beginning,
but to have a system able to respond in a simple way to queries like
"I want observations in this wavelength regime".  UCDs can (and should)
still be attached to columns for proper characterization of each data
column, but a solution can be found in a similar way to characterizing
the sky coverage (where one can split the sky in arbitrary tiles and
put 1 when observations exist in a given catalogue).

What I propose is a system which represents the whole electromagnetic
spectrum in a linear way. If one takes the space of log(wavelength)
going from 0.003 nm to 3km we have nearly 15 decades of coverage, which
could be split in 1000 parts to give enough spectral resolution.
Each photometric filter and bandpass will be represented by a series of
bits which should be set to 1.

A catalogue which contains Jonhson's V magnitue and B-V colour index
plus some radio data and X-ray data would have a fingerprint where the bits
on will be the ones corresponding to the B and V filters, the radio
bandpass(es) and the X-ray band(s). This information will be part of the
catalogue's metainformation and should be stored in data-centers and
possibly registries to which users will have access.

A user may then submit a query to a registry where s/he can decide which
ranges in the EMS to search for. The registry machine will create a "search
fingerprint" to compare with the catalogues it knows about and/or it could pass
this fingerprint to another grid service which will do its own search. The
user should then receive a list of catalogue handles which satisfy his/her
requirements.

A number of scenarios of search logics can be envisioned, from full
intersection to partial intersection of fingerprints. That is a point we
should develop based on use cases.

I've experimented with a solution where I split the interval (in log) in
15000 bins (1000 per decade) and it gives a reasonably good resolution in
all wavelength regimes. More testing is needed and suggestions are welcome.



The time domain

It presents itself as a similar problem to wavelength. One could define a
starting point, and fix a time resolution, then each timed observation
could be defined by a series of bits set to 1 wherever this observation
falls.

If one were to take 1 day  as the time resolution, 100yrs require  36525 bits
If one were to take 1 hour as the time resolution, 100yrs require 876600 bits

The numbers look large, but one can represent the time coverage of a
catalogue by just a few bits set to 1. Each catalogue time-fingerprint can
be reconstructed on the fly.

Again, a user may form his/her own time-fingerprint to perform searches,
like "I'm interested in recovering data for region X observed in this
period of time or periods separated by one year afterwards", eg, one wants
to measure proper motions.


In summary, by linearizing and binning these two quantities one can
build search engines which give users high flexibility to perform searches
and solve so the problem of multiplying UCDs to high levels.


Patricio F. Ortiz


On Mon, 17 Mar 2003, Anita Richards wrote:
>
>
> Sebastien's 'UCD: Status and Perspectives' gives a very clear summary of
> the recent discussions, responding on the basis of the considerable
.....

---
Dr. Patricio F. Ortiz			pfo at star.le.ac.uk
AstroGrid project
Department of Physics and Astronomy
University of Leicester			Tel: +44 (0)116 252 2015
LE1 7RH, UK


From jcm at head-cfa.cfa.harvard.edu  Wed Mar 19 05:36:13 2003
From: jcm at head-cfa.cfa.harvard.edu (jcm at head-cfa.cfa.harvard.edu)
Date: Wed, 19 Mar 2003 08:36:13 -0500 (EST)
Subject: UCD Status and Perspectives
Message-ID: <200303191336.h2JDaDs05535@urania.cfa.harvard.edu>


Dear Patricio,

 I think your suggestion ("UCDs for the photometric and time domain")
works well for search engines and catalog queries, but it does not work 
to describe the data precisely enough to do on-the-fly interconversions
("match this table with fluxes at 4100A to this other table with fluxes
at 4200A assuming a spectral index of 0.7") at the level of accuracy  
wanted for data analysis, never mind the problem of "convert this kind 
of B filter to this slightly different kind of B filter".  Maybe that's
OK, but in that case some other language analogous to UCDs will be
needed for robust data description and we should be clear that UCDs will
only apply to the query process (indeed their current and original
intention).

Anita's comments are well taken, but perhaps she can clarify:
you are suggesting replacing PHOT_FLUX_RADIO_1.4G with PHOT_FLUX
and a header UCD of OBS_FREQUENCY 1.4 GHz, right? But what if you
have three flux columns in the catalog, ( a bit like the problem
you alluded to of TIME_DATE for start and stop), say PHOT_FLUX_RADIO_1.4G
and PHOT_FLUX_RADIO_5.0G and PHOT_FLUX_RADIO_22.0G? Then we need three
OBS_FREQUENCY header UCDs and a way to map them to the respective columns
- which is essentially the 'parameterized UCD' I have suggested elsewhere.

 - Jonathan McDowell


From pfo at star.le.ac.uk  Wed Mar 19 06:18:43 2003
From: pfo at star.le.ac.uk (Patricio F. Ortiz)
Date: Wed, 19 Mar 2003 14:18:43 +0000 (GMT)
Subject: UCD Status and Perspectives
In-Reply-To: <200303191336.h2JDaDs05535@urania.cfa.harvard.edu>
Message-ID: <Pine.GSO.4.44L0.0303191353050.16092-100000@sparky.star.le.ac.uk>

Dear Jonathan,

On Wed, 19 Mar 2003 jcm at head-cfa.cfa.harvard.edu wrote:
> Dear Patricio,
>
>  I think your suggestion ("UCDs for the photometric and time domain")
> works well for search engines and catalog queries, but it does not work
> to describe the data precisely enough to do on-the-fly interconversions
> ("match this table with fluxes at 4100A to this other table with fluxes
> at 4200A assuming a spectral index of 0.7") at the level of accuracy
> wanted for data analysis, never mind the problem of "convert this kind
> of B filter to this slightly different kind of B filter".  Maybe that's
> OK, but in that case some other language analogous to UCDs will be
> needed for robust data description and we should be clear that UCDs will
> only apply to the query process (indeed their current and original
> intention).

I couldn't agree more with you on this point. Discovering the existence of
information is one issue, which could be solved with the scheme I proposed,
and with UCDs but converting or transforming quantities is a completely
different ball game.  As we discussed in the meeting at CfA, full
characterization of the filters and bandpasses should be achieved before
attempting the conversion and a lot of "knowledge" or expertise will be
required for us to get to this point.

Can you expand on your first example please? "match this table with
fluxes at 4100A to this other table with fluxes at 4200A assuming a
spectral index of 0.7" What do you have in mind? Do you want to match by
position first and then find the sources which have similar fluxes based on
4100 and 4200 band?

I find your example quite interesting, that's why I'd like to know more
what you have in mind.

>
> Anita's comments are well taken, but perhaps she can clarify:
> you are suggesting replacing PHOT_FLUX_RADIO_1.4G with PHOT_FLUX
> and a header UCD of OBS_FREQUENCY 1.4 GHz, right? But what if you
> have three flux columns in the catalog, ( a bit like the problem
> you alluded to of TIME_DATE for start and stop), say PHOT_FLUX_RADIO_1.4G
> and PHOT_FLUX_RADIO_5.0G and PHOT_FLUX_RADIO_22.0G? Then we need three
> OBS_FREQUENCY header UCDs and a way to map them to the respective columns
> - which is essentially the 'parameterized UCD' I have suggested elsewhere.
>
>  - Jonathan McDowell

Although the last question is for Anita, let me jump in the case as
well.  If I understand well enough, when you produce a catalogue which
contain observations in one frequency (band) one might think in calling
the column PHOT_FLUX and qualify the whole catalogue. Well, that was
exactly the situation we found in the published data. Tables made full
sense when attached to their paper, and even the table name could tell
us what band someone was observing. There were hundreds of tables where
the column name was "Mag"; taking the table out of context (like in a
table depository) one had no idea what this Mag meant, that's why UCDs
were introduced, to solve this kind of degeneracy. I feel that if we do so
with UCDs we'll go backwards in a sense.

Jonathan, can you point me to a document with your proposed 'parameterized
UCD'? I just searched with google and got nowhere :-(

Cheers,

Patricio

---
Dr. Patricio F. Ortiz			pfo at star.le.ac.uk
AstroGrid project
Department of Physics and Astronomy
University of Leicester			Tel: +44 (0)116 252 2015
LE1 7RH, UK


From Markus.Dolensky at eso.org  Thu Mar 20 07:58:55 2003
From: Markus.Dolensky at eso.org (Markus Dolensky)
Date: Thu, 20 Mar 2003 16:58:55 +0100
Subject: UCDs status and perspectives
References: <200303201516.h2KFG7P07723@rosetta.saclay.cea.fr>
Message-ID: <3E79E53F.3050209@eso.org>


Hi Pierre,

I couldn't agree more on the notion of your second point:

 > 2) Adding UCD.
 >
 > As Patricio said, "the problem is not to add more UCDs", everbody
 > would agree on that, but it is certainly _how_ to perform
 > the metadata bank update, when _really_ needed.
 > A very strict and tedious approvment by an "expert group",
 > as proposed in sebastien's doc, is certainly not appropriate
 > for a lot of cases, where quick even instantaneous
 > response is needed.
 > Once more, migrating to parametrized atomic Descr (PAD?),
 > will perhaps facilitate their dynamic handling.

It would be great if we could agree on some rules for using UCDs rather 
than looking at them individually. This might not be fully in line with 
the original idea when UCDs were invented as some sort of table column 
identifiers. The scope, however, is much broader now - it's about meta 
data in a more general sense. We need them in the registry, as query 
specifiers, as a way for interpreting VOTable docs, as tags in data 
models, ...

Markus

+---
| Markus Dolensky   Mailto:Markus.Dolensky at eso.org
| AVO Technical Lead          Web: www.euro-vo.org
| Voice: ++49 89 32006/261  Fax: ++49 89 32006/480
+---



From dide at discovery.saclay.cea.fr  Thu Mar 20 07:16:07 2003
From: dide at discovery.saclay.cea.fr (DIDELON Pierre)
Date: Thu, 20 Mar 2003 16:16:07 +0100 (MET)
Subject: UCDs status and perspectives
Message-ID: <200303201516.h2KFG7P07723@rosetta.saclay.cea.fr>


Hello UCD Fan's and Pro's,

the ongoing discussion seems very promising to me,
and the experts certainly have a goog understanding
of that's going on. Nevertheless I would like to make 
comments on three recurrent subjects. My point of view
is perhaps obvious and trivial, but as UCD, and more
generaly ontology, try to make implicit assumption
became explicit, I felt free to post the following.

The points are related to the UCD handling, 
the way of adding UCD,
and UCD usage at different levels.

1) UCD Handling

I was very happy to read the following in Sebastien's doc.
"The hierchical tree is not fundamental - 
it's merely a way of classification". What is actually very 
important for me is the knowledge base represented by
the UCDs, which certainly describe very well, even if not 
exhaustively the columns of astronomical catalogs.
The ways, different people want to look at this metadata
pond/container will certainly be differents.
But actually the UCD structure and even the name structure itself
does not promote or facilitate others point of view on this
fabulous metadata bank.
But as stressed also in sebastien's doc, "it is clear that 
the definition of right roots does not exist, and is influenced
by the user's own needs". 
It means that a static absolute and final UCD structuration
is not realistic, and so "different structures corresponding to
different views" of UCD must coexist.
It is one more argument in addition to a parametrized and atomic 
definition of Descriptors. 

2) Adding UCD.

As Patricio said, "the problem is not to add more UCDs", everbody
would agree on that, but it is certainly _how_ to perform
the metadata bank update, when _really_ needed.
A very strict and tedious approvment by an "expert group",
as proposed in sebastien's doc, is certainly not appropriate
for a lot of cases, where quick even instantaneous
response is needed.
Once more, migrating to parametrized atomic Descr (PAD?),
will perhaps facilitate their dynamic handling.
To clarify my point of view, perhaps a little bit too broad 
and common, let's take an example.

Try to imagine a Web service which can create data on the flight
and must be able to assign UCDs to these _dynamic_ data.
A very simple example would be a data bank of SED or photometric data
covering a very wide spectral range, and which can delivered 
a flux, mag, color or anyelse sensible combined data at whatever
wavelength required by the user. This service don't want 
to register one predifine UCD for any data conmbination
but needs only to parametrize the UCD and perhaps, in the most
complex case re-organize the basic predifined atoms.

Then the atoms definitions and the combination rules allowed
must be approved by an "expert group", but the parameter s
and the combinations used can be freely adapted by each
data provider, portal or anyelse service or tool.

3) UCD usage at different level

As already mention by sebastien and anita, any UCD
used as column description in one dataset can be used
as header or global metadata in another dataset,
and some times an association between these two uses
must be performed.
To my feeling the answer already exist in the VOTable 
structure. UCDs exist in two class, FIELD and PARAM.
And it is obvious that they are specialization of a more
general class which could be called vardescr (variables descriptors).
In the particular case of PARAM instances, the values are
attached to the description, while for the FIELD
the data link is more loosely. Adressing this more general
class would certainly facilitate the association between
global/header metadata and column description.
The main problem is that UCD are historically concerned
with column descriptors and so cover very well this field
of interest but it is not obvious how exhaustive are the
existing UCD to cover the needs of global metadata
used in headers (Fits) or definitions (VOTable).

I hope that these comments are not out of scope,
and that the expression of my feelings are not
unpleasant to anybody.

Sincerely yours,
Pierre Didelon









From dide at discovery.saclay.cea.fr  Thu Mar 20 08:25:38 2003
From: dide at discovery.saclay.cea.fr (DIDELON Pierre)
Date: Thu, 20 Mar 2003 17:25:38 +0100 (MET)
Subject: UCDs status and perspectives
Message-ID: <200303201625.h2KGPcu07938@rosetta.saclay.cea.fr>


> From Markus.Dolensky at eso.org Thu Mar 20 17:01:00 2003
> To: DIDELON Pierre <dide at discovery.saclay.cea.fr>
> CC: ucd at ivoa.net
> Subject: Re: UCDs status and perspectives
> 
> Hi Pierre,
> 
> I couldn't agree more on the notion of your second point:
> 
>  > 2) Adding UCD.
>  >
>  > As Patricio said, "the problem is not to add more UCDs", everbody
>  > would agree on that, but it is certainly _how_ to perform
>  > the metadata bank update, when _really_ needed.
>  > A very strict and tedious approvment by an "expert group",
>  > as proposed in sebastien's doc, is certainly not appropriate
>  > for a lot of cases, where quick even instantaneous
>  > response is needed.
>  > Once more, migrating to parametrized atomic Descr (PAD?),
>  > will perhaps facilitate their dynamic handling.
> 
> It would be great if we could agree on some rules for using UCDs rather 
> than looking at them individually.
 
I totally agree. What I had in mind  is not a traduction one by one of all
the existing UCD, but the definition of atoms and parameters which allow
to handle the existing UCD in a more flexible way. 
So, PAD can point to UCD, but the reverse would perhaps not always be true. 
But it is not clear to me, if the two systems coexists in the future,
which will be the needs of update synchronism and joined maintenance!

>...This might not be fully in line with 
> the original idea when UCDs were invented as some sort of table column 
> identifiers. The scope, however, is much broader now 

That's why PAD is perhaps more appropriate than UCD, because we no longer
deal only with column descriptors but with _global_ metadata.

>...- it's about meta 
> data in a more general sense. We need them in the registry, as query 
> specifiers, as a way for interpreting VOTable docs, as tags in data 
> models, ...
> 
> Markus
> 

Sorry for being unclear with rough english,
cordially,
Pierre


From borne at rings.gsfc.nasa.gov  Tue Mar 25 14:30:55 2003
From: borne at rings.gsfc.nasa.gov (Kirk Borne)
Date: Tue, 25 Mar 2003 17:30:55 -0500 (EST)
Subject: UCDs status and perspectives
Message-ID: <200303252230.RAA09366@rings.gsfc.nasa.gov>

Ray:  I believe that your suggestions carry a lot of merit.  I had a
nagging feeling when reading Jonathan's comments that our metadata
efforts could easily diverge (as you suggest) if we are not careful.
The data model is key to this -- consequently, the ability of XML
Schema to carry the knowledge about both the data model and the
metadata relationships, using standardized techniques, makes a lot
of sense -- especially with regard to reconciling the two metadata
approaches that you mention.  I think that disaster can be averted,
and Jonathan's and your suggestions can illuminate the way.  The
PHOT_FLUX(PHOT_BAND_ID) is an excellent example of the problem
and a good solution.

- Kirk


> Date: Tue, 25 Mar 2003 15:15:13 -0600 (CST)
> From: Ray Plante <rplante at poplar.ncsa.uiuc.edu>
> To: ucd at ivoa.net
> Subject: Re: UCDs status and perspectives
> 
> We have been bouncing around in our community two models for tagging
> metadata that we will eventually need to reconcile.  One is essentially
> XML-based and the other is based on the current UCD set.  The former makes
> the most sense for descriptions stored in a registry, while the latter is
> useful for tagging a set of data (e.g. in a table column).  Both are
> important and necessary.  Both reflect a common data model.  However, it
> would inconvenient if not disasterous if there were not a direct
> correlation between to two representations.
> 
> I feel the answer can be found in existing XML technologies.  I would 
> claim that the atomic descriptors being discussed (PAD, PCD, etc.) are 
> really just a short hop from an XML model.  The main thing that PCD has 
> in common with XML tags is that both are essentially pointers into a 
> data model.  The main difference between them is that with a UCD/PCD, we 
> need that pointer to be representable as a simple string (e.g. that can be 
> put in the ucd attribute in a VOTable).  
> 
> XML has such a pointer; it's called an XPath.  If we define the data 
> model as an XML Schema, then our UCD/PCDs fall right out.  There are other 
> advantages:
>   *  XML Schema provides a machine readable form for a data dictionary.
>   *  The extensibility of XML schemas provides the extensibility for 
>      UCDs automatically.  
>   *  When necessary, metadata in direct XML form (as envisioned in a 
>      registry) into UCD-tagged VOTable data.  
>   *  The modeling that Jonathan proposed is largely still applicable.
>   *  The approach is consistant with the data modeling activities that 
>      have been done to date.
> 
> As an example, consider the example Jonathan cited:
> 
> > For instance the two UCDs PHOT_FLUX_RADIO_1.4G
> > and PHOT_FLUX_RADIO_1.6G would map to a single PCD
> > PHOT_FLUX(PHOT_BAND_ID) with PHOT_BAND_ID taking the values 1.4 GHz and
> > 1.6 GHz. 
> 
> Suppose a data model defined more or less in the following way:
> 
>  <element name="PHOT">     
>    <complexType>           
>      <sequence>            
>        <element name="FLUX" type="fluxValue"/>  <!-- fluxValue and freqValue 
-->
>        <element name="FREQ" type="freqValue/>   <!--   defined elsewhere     
-->
>      </sequence>           
>    </complexType>          
>  </element>                
> 
> In direct XML, such a flux would be rendered as:
> 
>  <PHOT>
>    <FREQ>1.6 GHz</FREQ>
>    <FLUX>0.25 GHz</VALUE>
>  </PHOT>
> 
> The XPath pointing to the flux value would be:
> 
>   PHOT[FREQ='1.6 GHz']/FLUX
> 
> Note that there doesn't need to a direct XML representation like the
> one shown above for the XPath to carry meaning; it points into a data
> model describing Photometry.  
> 
> To make this model work, I think we need to...
>   * set some restrictions on how metadata are defined in XML Schema.
>     We may consider avoiding the defining attributes; this would make
>     XPaths simpler and it would integrate into SOAP more easily.
> 
>   * devise a consistant pattern representing measurements (i.e. value
>     and unit).  I'm *not* recommending the form in the above example.
> 
>   * build data models from the bottom up starting with common concepts
>     (e.g. physical quantities) that can be reused in different
>     contexts.  (Jonathan's model is relevent here.)  A freqency
>     should be represented the same way whether it is describing a flux
>     measurement or a bandwidth.  
> 
> cheers,
> Ray


+------------------------------------+-------------------------------------+
| Dr. Kirk D. Borne                  | mailto:Kirk.Borne at gsfc.nasa.gov     |
| Institute for Science & Technology, Raytheon (IST at R)                     |
| NASA Goddard Space Flight Center   |                                     |
| Astrophysics Data Facility         | Phone: 301-286-0696                 |
| Code 631                           |     or 301-286-2772:Kathy Starling  |
| Greenbelt, MD  20771               | FAX:   301-286-1771                 |
+------------------------------------+-------------------------------------+
  US Virtual Observatory:  http://us-vo.org/
  Staff page:     http://rings.gsfc.nasa.gov/~borne/bio_borne_kirk.html


From rplante at poplar.ncsa.uiuc.edu  Tue Mar 25 13:15:13 2003
From: rplante at poplar.ncsa.uiuc.edu (Ray Plante)
Date: Tue, 25 Mar 2003 15:15:13 -0600 (CST)
Subject: UCDs status and perspectives
In-Reply-To: <200303250343.h2P3hJN18502@urania.cfa.harvard.edu>
Message-ID: <Pine.LNX.4.44.0303251350530.7434-100000@poplar.ncsa.uiuc.edu>

We have been bouncing around in our community two models for tagging
metadata that we will eventually need to reconcile.  One is essentially
XML-based and the other is based on the current UCD set.  The former makes
the most sense for descriptions stored in a registry, while the latter is
useful for tagging a set of data (e.g. in a table column).  Both are
important and necessary.  Both reflect a common data model.  However, it
would inconvenient if not disasterous if there were not a direct
correlation between to two representations.

I feel the answer can be found in existing XML technologies.  I would 
claim that the atomic descriptors being discussed (PAD, PCD, etc.) are 
really just a short hop from an XML model.  The main thing that PCD has 
in common with XML tags is that both are essentially pointers into a 
data model.  The main difference between them is that with a UCD/PCD, we 
need that pointer to be representable as a simple string (e.g. that can be 
put in the ucd attribute in a VOTable).  

XML has such a pointer; it's called an XPath.  If we define the data 
model as an XML Schema, then our UCD/PCDs fall right out.  There are other 
advantages:
  *  XML Schema provides a machine readable form for a data dictionary.
  *  The extensibility of XML schemas provides the extensibility for 
     UCDs automatically.  
  *  When necessary, metadata in direct XML form (as envisioned in a 
     registry) into UCD-tagged VOTable data.  
  *  The modeling that Jonathan proposed is largely still applicable.
  *  The approach is consistant with the data modeling activities that 
     have been done to date.

As an example, consider the example Jonathan cited:

> For instance the two UCDs PHOT_FLUX_RADIO_1.4G
> and PHOT_FLUX_RADIO_1.6G would map to a single PCD
> PHOT_FLUX(PHOT_BAND_ID) with PHOT_BAND_ID taking the values 1.4 GHz and
> 1.6 GHz. 

Suppose a data model defined more or less in the following way:

 <element name="PHOT">     
   <complexType>           
     <sequence>            
       <element name="FLUX" type="fluxValue"/>  <!-- fluxValue and freqValue -->
       <element name="FREQ" type="freqValue/>   <!--   defined elsewhere     -->
     </sequence>           
   </complexType>          
 </element>                

In direct XML, such a flux would be rendered as:

 <PHOT>
   <FREQ>1.6 GHz</FREQ>
   <FLUX>0.25 GHz</VALUE>
 </PHOT>

The XPath pointing to the flux value would be:

  PHOT[FREQ='1.6 GHz']/FLUX

Note that there doesn't need to a direct XML representation like the
one shown above for the XPath to carry meaning; it points into a data
model describing Photometry.  

To make this model work, I think we need to...
  * set some restrictions on how metadata are defined in XML Schema.
    We may consider avoiding the defining attributes; this would make
    XPaths simpler and it would integrate into SOAP more easily.

  * devise a consistant pattern representing measurements (i.e. value
    and unit).  I'm *not* recommending the form in the above example.

  * build data models from the bottom up starting with common concepts
    (e.g. physical quantities) that can be reused in different
    contexts.  (Jonathan's model is relevent here.)  A freqency
    should be represented the same way whether it is describing a flux
    measurement or a bandwidth.  

cheers,
Ray


From amsr at jb.man.ac.uk  Wed Mar 26 04:09:57 2003
From: amsr at jb.man.ac.uk (Anita Richards)
Date: Wed, 26 Mar 2003 12:09:57 +0000 (GMT)
Subject: UCDs status and perspectives 
Message-ID: <Pine.GSO.4.53.0303261146390.2671@adikia>


Jonathan, Patricio et al:

Regarding Jonathan's example of a table with measurements of flux density
at 3 (or more) frequencies, and Patricio's comments,
http://www.ivoa.net/forum/ucd/0006.htm
I indeed think we should get away from PHOT_FLUX_RADIO_1.4G or anything
like that, and instead have some way of identifying a flux density
measurement with the frequency at which it was made, without having a
separate UCD for every frequency anyone uses. In the long run
Ray's proposal http://www.ivoa.net/forum/ucd/0011.htm  to use Xpath seems
exactly right, that is what I was trying to say in words (i.e. we need
values and attributes etc.).

However, is there a means of transition from the present use of UCDs, e.g.
by associating columns
FREQ  FLUX_DENSITY FLUX_DENSITY_ERROR
GHz      mJy           mJy
1.4     5              1
4.8     10             1
22.0    20             3

or whatever?

I suppose there are two problems here; firstly, to respond to Sebastien's
summary of the present discussion around UCDs - to see how much consensus
there is on what one would like in an idea world - and there seems to be
general agreement on the most general data models at least, different
groups may need more detail in different aspects but all the discussions
seem to be moving in the same direction.

Secondly, however, how much can be done 'seamlessly' based on the
existing, working CDS UCD system?  It is important to keep that going, not
just because astronoemrs depend on it and want to see it do these things
they hear about in reports from VO meetings, but because we need to test
developments on the community as much as possible, and we will find
subjects much more easily if we can give people prototypes which look as
familiar as possible (as with the AVO demo).  Also many new functions e.g.
the SED tool and VOPlot are being developed based on the existing UCDs.
Is this possible, is this the direction in which IDHA is going? Or will
there come a break point, and if so, when?

cheers
a



- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Dr. Anita M. S. Richards, AVO Astronomer
MERLIN/VLBI National Facility, University of Manchester,
Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL, U.K.
tel +44 (0)1477 572683 (direct); 571321 (switchboard); 571618 (fax).


From borne at rings.gsfc.nasa.gov  Wed Mar 26 04:24:32 2003
From: borne at rings.gsfc.nasa.gov (Kirk Borne)
Date: Wed, 26 Mar 2003 07:24:32 -0500 (EST)
Subject: UCDs status and perspectives 
Message-ID: <200303261224.HAA13806@rings.gsfc.nasa.gov>

Anita:  To answer your question about associating columns
(such as FREQ, FLUX_DENSITY, FLUX_DENSITY_ERROR in your example),
the answer is Yes.  XML Schema provide a natural mechanism
for such associations.  Before being shut down by NASA HQ,
the ADC had gone a long way toward building a full XML Schema
for astronomical data tables, which naturally accounted for
such table column associations that astronomers love to put
into their published papers.  What you see in print can be
hierarchically and syntactically rich.  How one builds that 
information into the Schema so that the column associations 
(including parents and children of split columns) is a
completely solvable problem.

- Kirk 
+------------------------------------+-------------------------------------+
| Dr. Kirk D. Borne                  | mailto:Kirk.Borne at gsfc.nasa.gov     |
| Institute for Science & Technology, Raytheon (IST at R)                     |
| NASA Goddard Space Flight Center   |                                     |
| Astrophysics Data Facility         | Phone: 301-286-0696                 |
| Code 631                           |     or 301-286-2772:Kathy Starling  |
| Greenbelt, MD  20771               | FAX:   301-286-1771                 |
+------------------------------------+-------------------------------------+
  US Virtual Observatory:  http://us-vo.org/
  Staff page:     http://rings.gsfc.nasa.gov/~borne/bio_borne_kirk.html


> Date: Wed, 26 Mar 2003 12:09:57 +0000 (GMT)
> From: Anita Richards <amsr at jb.man.ac.uk>
> To: ucd at ivoa.net
> Subject: Re: UCDs status and perspectives 
> 
> Jonathan, Patricio et al:
> 
> Regarding Jonathan's example of a table with measurements of flux density
> at 3 (or more) frequencies, and Patricio's comments,
> http://www.ivoa.net/forum/ucd/0006.htm
> I indeed think we should get away from PHOT_FLUX_RADIO_1.4G or anything
> like that, and instead have some way of identifying a flux density
> measurement with the frequency at which it was made, without having a
> separate UCD for every frequency anyone uses. In the long run
> Ray's proposal http://www.ivoa.net/forum/ucd/0011.htm  to use Xpath seems
> exactly right, that is what I was trying to say in words (i.e. we need
> values and attributes etc.).
> 
> However, is there a means of transition from the present use of UCDs, e.g.
> by associating columns
> FREQ  FLUX_DENSITY FLUX_DENSITY_ERROR
> GHz      mJy           mJy
> 1.4     5              1
> 4.8     10             1
> 22.0    20             3
> 
> or whatever?
> 
> I suppose there are two problems here; firstly, to respond to Sebastien's
> summary of the present discussion around UCDs - to see how much consensus
> there is on what one would like in an idea world - and there seems to be
> general agreement on the most general data models at least, different
> groups may need more detail in different aspects but all the discussions
> seem to be moving in the same direction.
> 
> Secondly, however, how much can be done 'seamlessly' based on the
> existing, working CDS UCD system?  It is important to keep that going, not
> just because astronoemrs depend on it and want to see it do these things
> they hear about in reports from VO meetings, but because we need to test
> developments on the community as much as possible, and we will find
> subjects much more easily if we can give people prototypes which look as
> familiar as possible (as with the AVO demo).  Also many new functions e.g.
> the SED tool and VOPlot are being developed based on the existing UCDs.
> Is this possible, is this the direction in which IDHA is going? Or will
> there come a break point, and if so, when?
> 
> cheers
> a
> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> Dr. Anita M. S. Richards, AVO Astronomer
> MERLIN/VLBI National Facility, University of Manchester,
> Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL, U.K.
> tel +44 (0)1477 572683 (direct); 571321 (switchboard); 571618 (fax).


From rplante at poplar.ncsa.uiuc.edu  Wed Mar 26 07:22:13 2003
From: rplante at poplar.ncsa.uiuc.edu (Ray Plante)
Date: Wed, 26 Mar 2003 09:22:13 -0600 (CST)
Subject: UCDs status and perspectives 
In-Reply-To: <Pine.GSO.4.53.0303261146390.2671@adikia>
Message-ID: <Pine.LNX.4.44.0303260905221.7434-100000@poplar.ncsa.uiuc.edu>

Hi,

> However, is there a means of transition from the present use of UCDs, e.g.
> by associating columns
> FREQ  FLUX_DENSITY FLUX_DENSITY_ERROR
> GHz      mJy           mJy
> 1.4     5              1
> 4.8     10             1
> 22.0    20             3
> 
> or whatever?

The need to associate columns and attach a collective meaning to them is
an issue that has come up numerous times.  The obvious case is that of RA
& Dec values that are stored in separate columns; however, as the above
example implies, the problem is more general.

In the NVO project, we have discussed ways in which VOTable might be 
extended to include descriptions of so-called "frames" (as in reference 
frame) that encapsulates these associations.  This would be made easier if 
it were possible to use exented metadata (e.g. Arnold's space-time 
coordinates schema).  We've discussed XML mechanisms to allow this; I 
think the next step, if we want to pursue this, is for someone to make a 
proposal.

> Secondly, however, how much can be done 'seamlessly' based on the
> existing, working CDS UCD system?  It is important to keep that going, not
> just because astronoemrs depend on it and want to see it do these things
> they hear about in reports from VO meetings, but because we need to test
> developments on the community as much as possible, and we will find
> subjects much more easily if we can give people prototypes which look as
> familiar as possible (as with the AVO demo).  Also many new functions e.g.
> the SED tool and VOPlot are being developed based on the existing UCDs.

I completely agree.  It will take some time to shake out a refactored 
model that covers everything already in the current UCDs.  Therefore, we 
will need a mechanism for continuing to support UCDs as they are now.

It's important to note that the current UCDs represent the most 
practical use-case as they were drawn directly from real catalogs.  As we 
build up more complicated models, e.g. photometry measurements, even 
images, we will need to make sure that the relevent UCD concepts are 
covered.  In fact, that could be made a formal of the definition process.

cheers,
Ray


From roy at cacr.caltech.edu  Wed Mar 26 08:19:13 2003
From: roy at cacr.caltech.edu (Roy Williams)
Date: Wed, 26 Mar 2003 08:19:13 -0800
Subject: Fw: UCDs and XML
Message-ID: <003a01c2f3b3$727a2be0$6601a8c0@roxy>

My thinking on UCD is going around the idea of "recognition".

In writing code for VO applications, I am looking for specific UCDs. Reading
the result of a cone search means finding the POS_EQ_RA_MAIN. Reading the
result of a SIAP means looking for the UCD called VOX:Image_AccessReference.

Therefore it should be allowed to have multiple UCDs describing the same
attribute, so that different applications can recognize and use it. One
person sees a galaxy, another sees a database record, another sees
clip-art -- but it's all the same entity underneath.

This recognition idea allows us to use UCD to subclass objects. If I have a
table from a cone search, then it must have UCDs corresponding to RA, Dec,
ID. Let us subclass this, for example, to a service that returns black-hole
candidates. In this case, we would expect further UCDs to be present:
BH_mass and BH_Spin.

There is a lot that can be done with UCD, and the real question is how to
allow this semantic flexibility to blossom, but without having everyone make
their own UCD and losing all interoperability!

Roy

---
Caltech Center for Advanced Computing Research
roy at cacr.caltech.edu
626 395 3670


From jcm at head-cfa.cfa.harvard.edu  Mon Mar 24 19:43:19 2003
From: jcm at head-cfa.cfa.harvard.edu (jcm at head-cfa.cfa.harvard.edu)
Date: Mon, 24 Mar 2003 22:43:19 -0500 (EST)
Subject: UCDs status and perspectives
Message-ID: <200303250343.h2P3hJN18502@urania.cfa.harvard.edu>

Dear UCD list,
 Following the discussion of last week, I append below some notes
on a controlled vocabulary related to UCDs that I sent to Sebastien
some time ago. It represents a more radical change than most people are
probably ready to go for, but I think it may be relevant to the current
discussion.

 - Jonathan McDowell

 --------------------------------------------------------------------

 I've been thinking a lot this week about UCDs and their possible
role in VO data models. My conclusion is that while the present design
of UCDs is very useful for the catalog cross matching problem, we need
a somewhat more flexible data dictionary to handle the data analysis
problem. I think we need both kinds of dictionary, with of course
a mapping between the two for the applications that need the appropriate
ones.

Specifically, I propose to parallel the UCDs with PCDs (Parameterized
Content Descriptors). These differ from UCDs in that they can include
functional parameters. For instance the two UCDs PHOT_FLUX_RADIO_1.4G
and PHOT_FLUX_RADIO_1.6G would map to a single PCD
PHOT_FLUX(PHOT_BAND_ID) with PHOT_BAND_ID taking the values 1.4 GHz and
1.6 GHz. This reflects the fact that PHOT_FLUX_RADIO_1.4G and
PHOT_FLUX_RADIO_1.6G do not really describe fundamentally different
physical quantities. The PCD also differ from UCD in that they are
organized to  form the bottom level attributes of a structured data
model for astronomy, so the top level domains are different from the
UCDs.

So far my proposed main PCD fields are

(1) about the universe
PHYS Physical data which is true generally and not a property of a 
     specific astronomical location or object.
POP  Properties of a population of astronomical objects
SAMPLE Properties of a sample of sources.
OBJ  The things we study are astronomical objects in space
      (with more or less defined boundaries).
MED  To understand the physics of these objects we describe the physical
     medium constituting them, including matter (solid, liquid, gas, plasma),
     radiation, and electromagnetic, gravitational and other fields.
LOS  A direction on the sky we observe corresponds to a line of sight
     along which objects may lie.    

(2) about our observations of the universe
SRC  When we have a dataset, we can identify a subset of that dataset
     as a source, which we can identify with an object.
     PCDs are SRC when they are to do with the direct measurements of an
     object with a telescope,
     and OBJ when they are to do with the intrinsic properties of the
     object (in its rest frame, without LOS effects etc).
BKG  A special sort of source we call the background
OBS  We have to describe things to do with the observing instrument,
     configuration and conditions.
     (a major subset is OBS_COV_ which )
SURVEY_ A group of observations
SRC_PHOT We measure the absolute intensity of radiation from the sky
SRC_SPEC Like PHOT, but dealing with many photon energies at once?
EVENT A detected photon or background event
_POS  Information about positions (also OBJ_POS etc)
_TIME Information about times (also in OBS_COV_TIME...?)

(3) about our analysis of the observations

DATA We also need to describe things about the datasets themselves.
REFER Bibliographic info

Below I give my first attempt at mapping the UCDs to a data model
oriented set of PCDs. There are quite a few UCDs that I still have to
understand by looking at their actual use in catalogs, so this is only a
sketch and some are left blank. At the end I give the beginnings of
extra UCD/PCD names needed for X-ray astronomy datasets.

Appendix 1: A possible list of PCDs to be the data model equivalent of UCDs.
Given in UCD alphabetical order.

PHYS_AT_                          AT                               Atomic Data
PHYS_AT_COLL                      AT_COLL                        Atomic Collisional Quantities
PHYS_AT_COLL_RATE                 AT_COLL_EXCIT-RATE           Collisional Excitation Rate
# Is this an atom prop or a line prop?
PHYS_AT_COLL_STRENGTH             AT_COLL_STRENGTH             Collisional strength
PHYS_AT_CONFIG    .               AT_CONFIG                      Electronic Configuration
PHYS_AT_CONST?                    AT_CONSTANT                    Atomic Constant
PHYS_AT_DAMPING_                  AT_DAMPING                     Atomic Damping Quantities
PHYS_AT_DAMPING_VDW               AT_DAMPING_VDWAALS           Van der Waals damping
?                                 AT_DATA                        Various Atomic data
PHYS_AT_DEGEN?                    AT_DEGENERACY                  Atomic Degeneracy Parameter
PHYS_AT_DIPOLE_?                  AT_DIPOLE                      Atomic Dipole
?                                 AT_DIPOLE_MISC               Atomic Dipole
PHYS_AT_DIPOLE_MOMENT             AT_DIPOLE_MOMENT             Atomic Dipole Moment
PHYS_AT_EIGENVECTOR               AT_EIGENVECTOR                 Atomic Eigenvector
PHYS_AT_ELECCOEFF                 AT_ELEC-COEFF                  Atomic Electric Coefficient
PHYS_AT_ELEMENT                   AT_ELEMENT                     Atomic Element Name or number, eventually with ionization stage
# See also PHYS_AT_Z
PHYS_PLASMA_EMISSIVITY_AT         AT_EMISSIVITY                  Atomic Emissivity
#What does this mean? It's a function of physical conditions.
#It's a property of the plasma expressed on a per-atom basis.
#So it's not PHYS_AT_EMISSIVITY but
#eg PHYS_PLASMA_EMISSIVITY_AT(Z,T,n)
PHYS_AT_ENERGY_                   AT_ENERGY                      Atomic Energy or Potential
#Heterogeneous class?
PHYS_AT_TRANS_NAME                AT_ENERGY_BAND               Atomic (molecular) Energy Band
PHYS_AT_TRANS_ENERGY_DISCREPANCY  AT_ENERGY_DIFF               Energy difference between experimental and calculated quantities
PHYS_AT_TRANS_ENERGY              AT_ENERGY_EXCIT              Excitation Energy
PHYS_AT_STATE_ENERGY_IONIZATION   AT_ENERGY_IONIZ              Ionization Energy or Potential
PHYS_AT_STATE_ENERGY(LEVEL)       AT_ENERGY_LEVEL              Energy Level
PHYS_AT_ENERGY_FORM               AT_ENERGY_FORMATION          Formation energy (or heat for molecules)
PHYS_AT_ENERG_POT                 AT_ENERGY_POTENTIAL          Atomic Energy or Potential
PHYS_AT_STATE_ENERGY_ROT          AT_ENERGY_ROTATION           Rotation Energy
PHYS_AT_STATE_ENERGY_TOT          AT_ENERGY_TOTAL              Total atomic energy
PHYS_AT_TRANS_FREQ                AT_FREQUENCY                   Transition Frequency
PHYS_AT_TRANS_FREQ_REST           AT_FREQUENCY_NU              Transition Frequency at rest
PHYS_AT_TRANS_FREQ_ROT            AT_FREQUENCY_ROTAT           Rotation Frequency
PHYS_AT_FS_                       AT_FS                          Fine Structure Quantities
PHYS_AT_FS_COLLSTR                AT_FS_COLL-STR               Fine Structure Collision Strength
PHYS_AT_FS_CONST?                 AT_FS_CONSTANT               Fine Structure Constant
PHYS_AT_TRANS_FS_WIDTH            AT_FS_CONTRIB                Fine Structure Contribution to Line Profile
PHYS_AT_TRANS_FS_SPLIT            AT_FS_SPLIT                  Fine Structure Splitting
PHYS_AT_TRANS_GA                  AT_GA                          Atomic ga value
PHYS_AT_LINE_INTENSITY            AT_INTENSITY                   Line Intensity
PHYS_AT_ION_                      AT_ION                         Ions
PHYS_AT_ION_ID                    AT_ION_ID                    Ion Identification
PHYS_AT_ION_STAGE                 AT_ION_STAGE                 Ionization Stage
PHYS_AT_LANDEFACT                 AT_LANDE-FACT                  Lande Factor (gf)
PHYS_AT_LEVEL                     AT_LEVEL                       Level Identification
PHYS_AT_STATE_LIFE                AT_LIFETIME                    Radiative Lifetime
PHYS_AT_LINE_                     AT_LINE                        Atomic or Molecular Lines
# What is the difference between LINE and TRANS?
PHYS_AT_LINE_EMISSIVITY           AT_LINE_EMISSIVITY           Line Emissivity
PHYS_AT_LINE_FLOURYIELD           AT_LINE_FLUOR-YIELD          Line Fluorescence Yield
PHYS_AT_LINE_ID                   AT_LINE_ID                   Line Identification
PHYS_AT_LINE_STRENGTH             AT_LINE_STRENGTH             Line Strength
PHYS_AT_LINE_MAIN-TERM?           AT_MAIN-TERM                   Main Term
PHYS_AT_MOL_                      AT_MOL                         Quantities Related to Molecules
PHYS_AT_MOL_DIELFN                AT_MOL_DIEL-FN               Molecular Dielectric Function
PHYS_AT_MOL_EDISSOC               AT_MOL_DISS-ENRGY            Molecular Dissociation Energy
PHYS_AT_MOL_ID                    AT_MOL_ID                    Molecule Identification
PHYS_AT_TRANS_MOL_LEVEL           AT_MOL_LEVEL                 Molecule Transition Level
PHYS_AT_MULTIPLET_                AT_MULTIPLET                   Quantities Related to Multiplets
PHYS_AT_MULTIPLET_ID              AT_MULTIPLET_ID              Multiplet Identification
PHYS_AT_MULTIPLET_N               AT_MULTIPLET_N               Multiplet Number element
PHYS_AT_Z                         AT_NUMBER                      Atomic Number
PHYS_AT_OSC_                      AT_OSC                         Oscillator Related Quantities
PHYS_AT_OSC?                      AT_OSC_STRENGTH              Oscillator Strength
PHYS_AT_PARITY                    AT_PARITY                      Atomic Parity
PHYS_AT_Q_                        AT_Q-N                         Atomic Structure, Quantum Numbers
PHYS_AT_Q_L                       AT_Q-N_ANG-MOM               Angular Momentum Quantum Number
PHYS_AT_Q_K                       AT_Q-N_K                     K quantum number
PHYS_AT_Q_UNK                     AT_Q-N_MISC                  Atomic Structure Quantum Number
PHYS_AT_Q_ORB                     AT_Q-N_ORBITAL               Orbital Quantum Number
PHYS_AT_Q_PRIN                    AT_Q-N_PRINCIPAL             Principal Quantum Number
PHYS_AT_Q_PRIN1                   AT_Q-N_PRINCIPAL_FIRST     First Principal Quantum Number
PHYS_AT_Q_PRIN2                   AT_Q-N_PRINCIPAL_SECOND    Second Principal Quantum Number
PHYS_AT_Q_ROT                     AT_Q-N_ROTATIONAL            Rotational Quantum Number
PHYS_AT_Q_TOR                     AT_Q-N_TORSIONAL             Torsional Quantum Number
PHYS_AT_Q_VIB                     AT_Q-N_VIBRATIONAL           Vibrational Quantum Number
PHYS_AT_REACTION                  AT_REACTION                    Atomic Reaction
PHYS_AT_SHELL                     AT_SHELL-NUMBER                Shell Quantum Numbers
PHYS_AT_SPECIES_LIST              AT_SPECIES                     Atomic Species Participating in a Reaction
PHYS_AT_TRANS_STARK_              AT_STARK                       Stark Effect
PHYS_AT_TRANS_STARK_BROAD         AT_STARK_BROAD               Broadening due to Stark Effect
PHYS_AT_TRANS_STARK_INT           AT_STARK_INTENSITY           Intensity due to Stark Effect
PHYS_AT_TRANS_SWEIGHT             AT_STAT-WEIGHT                 Statistical Weight
PHYS_AT_TRANS_WIDTH?              AT_STRENGTH-PARAM              Strength Parameter or Expect Width
PHYS_AT_TRANS                     AT_TRANS                       Quantities Related to Transitions
PHYS_AT_TRANS_BRANCH              AT_TRANS_BRNCH-RATIO         Transition Branching Ratio
PHYS_AT_TRANS_ENERGY              AT_TRANS_ENERGY              Transition Energy (or wave number)
PHYS_AT_TRANS_ID                  AT_TRANS_ID                  Transition Identification
PHYS_AT_TRANS_LEVELS              AT_TRANS_LEVELS              Transition Level

PHYS_AT_TRANS_PROB                AT_TRANS_PROB                Transition Probability
PHYS_AT_TRANS_STRENGTH            AT_TRANS_STRENGTH            Transition Strength
PHYS_AT_TRANS_TYPE                AT_TRANS_TYPE                Transition Type
PHYS_AT_TRANS_RECOMB              AT_TRANS_RECOMBIN            Recombination coefficients in atomic transitions
PHYS_AT_TRANS_LAMBDA              AT_WAVELENGTH                  Laboratory or Theoretical Line Wavelength
PHYS_AT_WEIGHT                    AT_WEIGHT                      Atomic Weight
OBJ_CLASS+                        CLASS                            Various Classification Descriptors
OBJ_CLASS_CODE                    CLASS_CODE                     Classification Code
OBJ_CLASS_COLOR                   CLASS_COLOR                    Color Classification
OBJ_CLASS_STAR_MK_TYPE
OBJ_CLASS_CLG_DIST                CLASS_DISTANCE                 Abell Distance Class
OBJ_CLASS                         CLASS_MISC                     Various Classification Descriptors
OBJ_CLASS                         CLASS_OBJECT                   Object Type Classification
OBJ_CLASS_CLG_RIC                 CLASS_RICHNESS                 Abell Richness Class
OBJ_CLASS_UNK_GAL                 CLASS_STAR/GALAXY              Star galaxy discriminator or classification.
OBJ_CLASS_UNK_BM                  CLASS_STRUCT                   Structure Classification (e.g. cluster Bautz-Morgan classification)
_CODE                             CODE                             Codes or Flags
_ERROR_CODE                       CODE_ERROR                     Flag denoting uncertainty about a given quantity
_FLAG_LIMIT                       CODE_LIMIT                     Lower or Upper limit Flag
_FLAG_MEMB                        CODE_MEMB                      Membership Code
_CODE                             CODE_MISC                      Miscellaneous Codes or Flags
OBJ_CLASS_MULT                    CODE_MULT                      Codes related to Multiplicity (particularly stars)
OBJ_CLASS_MULT                    CODE_MULT_FLAG               A code or flag indicating a multiplicity of binarity
OBJ_CLASS_MULT_N                  CODE_MULT_FREQUENCY          Multiplicity Frequency Code
OBJ_CLASS_MULT_N                  CODE_MULT_INDEX              Multiplicity Index Code
_QUAL                             CODE_QUALITY                   Quality Code
OBJ_CLASS_VAR                     CODE_VARIAB                    Variability Code or Flag
DATA_                             DATA                             Quantities Related to the Data
_SCALE_EXP                        DATA_FACTOR-EXP                Scale Factor Exponent (Base 10)
DATA_LINK                         DATA_LINK                      Link to additional data (in VizieR or any other database)
_MAX                              DATA_MAXIMUM                   Maximum data value found in a database column
_SCALE                            DATA_SCALE-FACTOR              Factor to Convert a Data Column to a normal value
_DATATYPE                         DATA_TYPE                      Data Type
DYN_                              DYN                              Dynamic Data Quantities (mixed column content)
DYN_QUANTITY                      DYN_QUANTITY                   Used when a Column means more than one thing.
DYN_VALUE                         DYN_VALUE                      Identification of a Dynamic Value
_ERROR                            ERROR                            Error or Uncertainty in Measurements
POS(,EQ)_RA_ERROR                 ERROR  # I/176
POS(,EQ)_DEC_ERROR                ERROR  # I/176
PHOT_FLUX(5 GHz)_ERROR            ERROR  # VIII/14
SRC_REG                           EXTENSION                        Quantities used to describe the extension in the sky of objects
SRC_REG_AREA                      EXTENSION_AREA                 Angular Area Covered by an Object
SRC_REG_DIA_DEC                   EXTENSION_DEC                  Angular Extension in Declination
SRC_REG_DIA                       EXTENSION_DIAM                 Angular Diameter or Size of the Major Axis
SRC_REG_DIA_FWHM                  EXTENSION_FWHM                 Angular Full Width at Half Maximum (FWHM)
SRC_REG_DIA_FWHM                  EXTENSION_FWHM_CIRC          Angular Full Width at Half Maximum (FWHM)
SRC_REG_DIA_MAJ_AXIS_FWHM         EXTENSION_FWHM_MAJ           Angular FWHM along the Major Axis
SRC_REG_DIA_MIN_AXIS_FWHM         EXTENSION_FWHM_MIN           Angular FWHM along the Minor Axis
SRC_REG_DIA_MIN_AXIS_FWHI         EXTENSION_HALFINT            Angular Size at Half Intensity along the Minor Axis
SRC_REG_DIA_MIN_AXIS              EXTENSION_MIN                  Angular Diameter of an object along the Minor Axis
SRC_REG_DIA_BEAMS                 EXTENSION_NORM                 Angular diameter normalized to beam size
SRC_REG_DIA_RA                    EXTENSION_RA                   Angular extension in right ascension
SRC_REG_RADIUS                    EXTENSION_RAD                  Angular radius of an object or Semi-major axis
SRC_REG_RADIUS_SCALELENGTH        EXTENSION_SC-LENGTH            Angular Scale Length (bulge or disk)
SRC_REG_RADIUS_MIN_AXIS           EXTENSION_SMIN                 Angular size of Semi-Minor Axis
_FIT                              FIT                              Fits of Models to Observational Data
_FIT_ERR                          FIT_ERROR                      Fit Error
_FIT_GOODNESS                     FIT_GOODNESS                   Fit Goodness
_FIT_ID                           FIT_ID                         Identification of the fit or solution
POP_LF                            FIT_LF                         Luminosity function
POP_LF_FIT_PARAMS                 FIT_LF                         Fit of Luminosity Function
POP_LF_FIT                        FIT_LF_GENERAL               Fit of Luminosity Function
POP_LF_FIT_MAG?                   FIT_LF_MAG                   Magnitudes related to the LF
POP_LF_FIT_MAG_MAX                FIT_LF_MAG_MAX             Magnitude interval upper limit
POP_LF_FIT_MAG_MIN                FIT_LF_MAG_MIN             Magnitude interval lower limit
_FIT_RATIO                        FIT_MEAS/THEOR                 Ratio of Measurement to Theoretical Value
_FIT_PAR                          FIT_PARAM                      Fit Parameter
_FIT_PAR_ID                       FIT_PARAM_ID                 Fit Parameter Identification
_FIT_MISC                         FIT_PARAM_MISC               Miscellaneous fit parameters
POS(,EQ)_RA_STAT_SIGMA            FIT_PARAM_MISC
# In I/176 S0RA, FIT_PARAM_MISC is the sigma-0 (?) for the RA
_FIT_COVAR                        FIT_PARAM_COVAR              Covariance of the fitting parameter
_FIT_RESID                        FIT_RESIDUAL                   Fit Residual
_FIT_CHI2                         FIT_CHI2                       Chi-square Fit Measurement
_FIT_SIGMA                        FIT_STDEV                      Fit's Standard Deviation
_FIT_TYPE                         FIT_TYPE                       Fit or Solution Type
POS(,EQ)_FIT_TYPE                 FIT_TYPE    I/176
_ZERO                             FIT_ZP                         Fit Zero Point (mostly in linear fits)
PHOT_COL_INDEX_DIFF               FIT_ZP
# In III/218 DIFF, FIT_ZP is the scatter in mag of the spectroscopic index
POS(,EQ)_DEC_STAT_SIGMA           FIT_ZP
# In I/176 S0DE, FIT_ZP is the sigma-0 (?) in arcseconds? for the Dec
-                                 ID                               Fields Used as Identifiers
OBJ_ID_ALT                        ID_ALTERNATIVE                 Alternative identification
OBJ_ID_FIELD                      ID_AREA                        Area Identification (usually in a photographic plate)
SRC_ID_XID                        ID_ASSOCIATED                  Identification of Associated Object (counterpart)
SRC_ID_AUTHOR                     ID_AUTHOR                      Author Name
SRC_ID_CAND                       ID_CANDIDATE                   Candidate Identification
SRC_ID_CAT                        ID_CATALOG                     Catalog Identification
SRC_ID_FCHART                     ID_CHART                       Finding Chart Identification
SRC_ID_COMP                       ID_COMPARISON                  Name of a Comparison Object
SRC_ID_CONSTEL                    ID_CONSTEL                     Constellation Name
SRC_ID_XID                        ID_CROSSID                     Cross Identification (counterpart)
OBS_DB_ID                         ID_DATABASE                    Database Identification
OBS_DS_ID                         ID_DATASET                     Data-Set Identification
OBS_EXP_ID                        ID_EXPOSURE                    Exposure Identification
INST_FIBER                        ID_FIBER                       Fiber Optics Identification (for M.O.S.)
OBS_FIELD                         ID_FIELD                       Field Identification
SRC_NOTES_FIG                     ID_FIGURE                      Figure Identification Number
SRC_NOTES_FILE                    ID_FILE                        File Identification
SRC_NOTES_FRAME                   ID_FRAME                       Frame Identification
?                                 ID_GROUP                       Group Identification
OBS_AUTHOR_CODE                   ID_HUMAN                       Identification of Discoverer or Observer
SRC_DISCOVERER_CODE               ID_HUMAN
SRC_ID_INTERNAL                   ID_IDENTIFIER                  Identification of a source or object, incomplete or for internal use.
OBS_IMAGE_ID                      ID_IMAGE                       Image Identification
SRC_ID   (or OBJ_ID?)             ID_MAIN                        Main Identifier of a Celestial Object
SRC_ID:1                          ID_MAIN:1                      First component of an identification field.
SRC_ID:2                          ID_MAIN:2                      Second component of an identification field.
SRC_ID:3                          ID_MAIN:3                      Third component of an identification field.
?                                 ID_MAP                         Map Identification
SRC_CAT_ID                        ID_NUMBER                      Numeric Identification (usually sequential)
?                                 ID_PARAM                       Identification or name of a parameter, or the name of a column in a table
SRC_PARENT                        ID_PARENT                      Parent Identification (galaxy, cluster, nebulae)
OBS_PLATE                         ID_PLATE                       Plate Identification
OBS_REGION_ID                     ID_REGION                      Region Identification (not necessarily sky region)
OBS_SET_ID                        ID_SET                         Set or Subset Identification, also bin or sample number
OBS_SITE_ID                       ID_SITE                        Site/Location/Observatory/City/Country identifier
INST_APER_ID                      ID_SLIT                        Slit Identification (usually in the context of M.O.S.)
# Hmm MOS have many apertures, 1 disperser?
SRC_ID_SURVEY                     ID_SURVEY                      Survey Identification
SRC_ID_TABLE                      ID_TABLE                       Table Identification
SRC_ID_TARGET?                    ID_TARGET                      Target Identifier
OBJ_CLASS_VAR?                    ID_VARIAB                      Variable Object Identification
DATA_PROC_SYS_VER                 ID_VERSION                     Identification of the software version.
?                                 ID_VOLUME                      Volume Identification
?                                 ID_ZONE                        Durchmusterung zone identification/sign
INST_                             INST                             Instrumental Quantities
-                                 INST_ANG                       Angular Properties of the Instruments/Telescopes
SRC_OFFAX                         INST_ANG_OFFAXIS             Off-axis angle respect to main direction of observation
# Presumably the instrument coords of a source, not a prop of the instru
OBS_SITE_ORBIT_PHASEANG           INST_ANG_PHASE               Satellite phase angle
INST_RESP_SPATIAL_RES             INST_ANG_RESOL               Angular resolution of instrument
OBS_SITE_ORBIT_ANGVEL             INST_ANG_VEL                 Satellite angular velocity
INST_DET_NOISE_TANT               INST_ANTENNA-TEMP              Antenna temperature
INST_GEOM_DIA                     INST_APERT                     Instrument/telescope aperture
INST_GEOM_AREA                    INST_AREA                      Collecting area or detector area
PHOT_BKG_INST                     INST_BACKGROUND                Background contribution
INST_COV_BAND                     INST_BAND                      Instrumental Band quantities
INST_CAL_BAND_DRIFT               INST_BAND_DRIFT              Band's drift rate
INST_COV_BAND_TRANS?              INST_BAND_PASS               Bandpass
INST_COV_BAND_WIDTH               INST_BANDWIDTH                 Spectral window used for the observation
INST_INT_BASELINE                 INST_BASELINE                  Baseline (interferometry)
INST_RESP_SPATIAL                 INST_BEAM                      Beam properties
?                                 INST_BEAM_MISC               Miscellaneous beam properties
INST_RESP_SPATIAL_RES             INST_BEAM_SIZE               Beam width or size
INST_DET_NOISE_TBEAM              INST_BEAM_TEMP               Beam temperature
INST_PHOT_CAL                     INST_CALIB                     Instrument calibration quantities
INST_PHOT_CAL_ERR                 INST_CALIB_ERROR             Instrument calibration error
?                                 INST_CALIB_MISC              Miscellaneous instrument calibration quantities
?                                 INST_CALIB_PARAM             Calibration parameter
?                                 INST_CORR-FACTOR               Correction (no only correction factor)
INST_DET                          INST_DET                       Detector parameters
INST_PHOT_FLUX_LIMIT              INST_DET_LIMIT               Detector limit
UNK                               INST_DET_MISC                Miscellaneous quantities related to the detector (plate or CCD)
INST_GEOM_SIZE                    INST_DET_SIZE                Detector size
# number of pixels, vs DET_SIZE with mm size
INST_DISP_SCALE                   INST_DISPERSION                Dispersion scale in a spectrograph
INST_QE                           INST_EFFICIENCY                Instrument efficiency
PHOT_ERR_INST                     INST_ERROR                     Errors associated to the instrument
INST_FILTER                       INST_FILTER                    Filter characteristics
INST_FILTER                       INST_FILTER_CODE             Filter characteristics type/code
INST_COV_BAND_FWHM                INST_FILTER_FWHM             FWHM of the used filter (also bandpass)
INST_COV_BAND_TRANS               INST_FILTER_TRANSM           Transmission characteristics of the filter (response)
INST_NAME                         INST_ID                        Instrument/Detector Identification
INST_LINE_WIDTH                   INST_LINE-WIDTH                Instrumental Line-Width
INST_DET_NOISE                    INST_NOISE                     Detector/Instrument noise level rms
INST_PARAM?                       INST_PARAM                     Various Instrumental Parameters
INST_GEOM_PIX_SIZE                INST_PIXSIZE                   Pixel Size
# distinguish pix size in mm and arcsec
INST_DET_PLATE                    INST_PLATE                     Quantities related to Photographic Plates
INST_DET_SIZE                     INST_PLATE_DIMENSION         Size or plate dimension
# Is the fact that it's a plate relevant? could be any detector
SRC_OFFSET_PIX                    INST_PLATE_DIST              Distance measurement on a plate
# ? distance between two sources in pixels?
INST_DET_PLATE_EMULSION           INST_PLATE_EMULSION          Plate Emulsion Type
# Now we care about it being a plate, only plates have emulsion
SRC_REG_DIA_PIX                   INST_PLATE_EXTENSION         Extension of an object in a plate (in plate units)
INST_DET_POS                      INST_POS                       Position on a detector or M.O.S template
INST_PHOT_PRECISION               INST_PRECISION                 Instrumental Precision
# Presumably photometric?
INST_RESP_SPATIAL                 INST_PSF                       Detector's Point Spread Function (PSF)
INST_DET_QE                       INST_QE                        Detector's Quantum Efficiency
SRC_DET_SN                        INST_S/N                       Instrumental signal to noise ratio (S/N)
# What does this mean? The S/N for a particular source?
INST_RESP_TIME_RES                INST_SAMP-TIME                 Instrumental Sampling Time
INST_GEOM_SCALE                   INST_SCALE                     Instrumental Scale (ccd or plate)
#  In arcsec/mm? otherwise pixel size
INST_RESP_SPATIAL_RES             INST_SEEING                    Seeing or fwhm of PSF
INST_PHOT_FLUX_LIMIT              INST_SENSITIVITY               Detector's Sensitivity (Flux limit)
INST_SETUP                        INST_SETUP                     Instrument configuration or set-up
-                                 INST_SKY                       Instrumental Sky Properties
PHOT_COUNTS_SKY?                  INST_SKY_LEVEL               Local Sky Level
PHOT_TEMP_SKY                     INST_SKY_TEMP                Sky Temperature
PHOT_TEMP_SIGMA_SKY               INST_SKY_SIGMA               Sigma of sky value distribution
-                                 INST_SPECT                     Spectroscopic instruments' quantities
INST_COV_BAND_LAMBDA_RANGE        INST_SPECT_BAND              Spectroscopic observation band
INST_DISP_TYPE_CODE               INST_SPECT_CODE              Spectroscopic instrument specification (prism, grism, grating)
INST_DISP_ORDER                   INST_SPECT_ORDER             Spectral Order
INST_DISP_SLIT_DX                 INST_SPECT_SLIT-LENGTH       Slit Length
INST_DISP_SLIT_DY                 INST_SPECT_SLIT-WIDTH        Slit Width
-                                 INST_TEMP                      Instrument Temperature (radio regime)
INST_DET_NOISE_TBEAM              INST_TEMP_BEAM               Beam Temperature or Brightness
# TEMP_BEAM is a way of describing the instrument noise
INST_DET_TSYS                     INST_TEMP_SYST               System Temperature
INST_DET_TRIGGER?                 INST_TRIGGER                   Detector's triggering Threshold
INST_TYPE                         INST_TYPE                      Instrument Type
INST_COV_BAND_VEL?                INST_VELOC                     Velocity Quantities at the Instrumental Level
INST_COV_BAND_VEL0                INST_VELOC_CENTRAL           Instrumental Central Velocity
INST_COV_BAND_VEL_RES             INST_VELOC_SPACING           Instrumental Velocity Channel Spacing
INST_COV_BAND_VEL_RANGE           INST_VELOC_WINDOW            Detector's Velocity Range
OBS_COV_BAND_LAMBDA               INST_WAVELENGTH                Observation's Wavelength properties
# We should distinguish between the wavelength coverage designed into an instrument
# and the wavelength coverage of a specific observation, I think the latter is meant here.
OBS_COV_BAND_LAMBDA_RANGE         INST_WAVELENGTH_COVERAGE     Instrument's Wavelength Range
OBS_COV_BAND_LAMBDA_EFF           INST_WAVELENGTH_EFFECTIVE     Observation's Effective Wavelength
OBS_COV_BAND_LAMBDA               INST_WAVELENGTH_VALUE        Wavelength related to an instrument, filter, etc.
MUTUAL_OCCULT(*OBJ)               -    
MUTUAL_OCCULT(L)                  LUNAR-OCCULT                     Lunar Occultaion related quantities
# Occultations of anything could have the same parameters. So let's specify that
# it's lunar by an argument L, and generalize eg
#  MUTUAL_OCCULT(PLUTO)_ANG
MUTUAL_OCCULT(L)_ANG              LUNAR-OCCULT_ANGLE             Lunar Occultation Contact Angle
MUTUAL_OCCULT(L)_FRAC             LUNAR-OCCULT_FRACTION          Percentage of the moon illuminated during the time of occultation
MUTUAL_OCCULT(L)_LIMBSLOPE        LUNAR-OCCULT_LIMB-SLOPE        Lunar Occultation Limb Slope
_MODEL                            MODEL                            Quantities generated by Models
SPEC_CONT_FLUX                    MODEL_CONTINUUM                Continuum level
_CORR                             MODEL_CORRECTION               Correction or adjustment
OBJ_VEL_DRIFT                     MODEL_DRIFT-VELOC              Terminal drift velocity
OBJ_GEOM_TRIAX                    MODEL_DYN-TRIAX                Dynamical triaxiality
?                                 MODEL_ENERGY                   Energy modeled quantities
SPEC_SED_MODEL                    MODEL_ENERGY_DIST            Energy distribution
PHYS_BULK_EOS                     MODEL_EOS                      Equation of state
PHYS_BULK_EOS_ID                  MODEL_EOS_ID                 Name of used equation of state
LOS_ISM_EXT                       MODEL_EXTINCTION               Interstellar extinction quantities
LOS_ISM_EXT_COEFF                 MODEL_EXTINCTION_COEFF       Insterstellar extinction coefficient
# Extinction coeffs and other theory are always 'model'.
_MODEL_FEATURE                    MODEL_FEATURE                  Model Feature
PHOT_FLUX_MODEL                   MODEL_FLUX                     Modeled Flux
_MODEL_ID                         MODEL_ID                       Model Identification
SPEC_LINE_FLUX_MODEL              MODEL_LINE-FLUX                Model Spectral Line Flux
PHOT_MAG_MODEL                    MODEL_MAG                      Model-generated Magnitude
_MODEL_DIFF                       MODEL_MAG_CORR               Magnitude Correction or Difference
_MODEL                            MODEL_MAG_VALUE              Magnitude (in any band) generated by a model (or templates)
?                                 MODEL_MOMENT-FLUX-RATIO        Moment Flux Ratio
_MODEL_PARAM                      MODEL_PARAM                    Model Parameter
POP_SPEC_SYNTH                    MODEL_POP-SYNTHESIS            Population Synthesis Quantity
_MODEL_RESIDUAL                   MODEL_RESIDUAL                 Model Residual
_MODEL_RESULT                     MODEL_RESULT                   Model Solution Value
_MODEL_TYPE                       MODEL_TYPE                     Model Type
PHYS_AT_TRANS_ZEEMAN              MODEL_ZEEMAN                   Zeeman Effect Quantities
PHYS_AT_TRANS_ZEEMAN_CO           MODEL_ZEEMAN_COEFF           Zeeman Effect Coefficient
OBJ_CLASS_MORPH?                  MORPH                            Morphology of celestial objects
OBJ_CLASS_GAL_ARMS                MORPH_ARMS                     Spiral Arms Structure (galaxies)
OBJ_CLASS_GAL_ARMS_RATIO          MORPH_ARMS_RATIO             Ratio of Spiral Arm (galaxies)
OBJ_CLASS_GAL_ARMS_WOUND          MORPH_ARMS_WOUND             Wound Parameter of a spiral arm galaxy
OBJ_CLASS_GAL_ASYM                MORPH_ASYMMETRY                Asymmetry Induced by Rotation
OBJ_CLASS_GAL_BAR                 MORPH_BAR                      Presence or detection of a bar in a galaxy
OBJ_CLASS_MORPH_CODE              MORPH_CODE                     Code refering to a morphological property
OBJ_CLASS_MORPH_PARAM             MORPH_PARAM                    Morphological (geometrical) parameter
OBJ_CLASS_MORPH_TYPE              MORPH_TYPE                     Morphological Type
_NOTE                             NOTE                             A Note related to a certain quantity or value
_N                                NUMBER                           Number Of ``things'' (stars, observations, etc.)
OBJ(*OBJ)                         -                               Specific object
OBJ(E)_NUT                        NUTATION                         Earth's Nutation Related Quantities
OBJ(E)_NUT_ANGLE                  NUTATION_PARAM                 Nutation Parameter
# I'm guessing this is the angle
_OBS ?                            OBS                              Observational Quantities
SRC_REG_DIA                       OBS_ANG-SIZE                   Observational angular size
OBS_INST_BAND                     OBS_BAND                       Band or Filter used for the observation
PHOT_CAL                          OBS_CALIB                      Calibrations related to observations
PHOT_CAL_ZERO                     OBS_CALIB_CONST              Calibration's Constant
PHOT_CAL_SCALE                    OBS_CALIB_FACTOR             Calibration conversion factor
# This is heterogeneous...I'm guessing flux cal is meant here, but
# need ones for wave cal too etc
OBS_ID                            OBS_CODE                       Observation code for observing run
OBS_SITE_CONDS                    OBS_CONDITIONS                 Observation condition
PHOT_LIMIT                        OBS_DETECT-LIMIT               Detection Limit
# This is a property of a region of an observation - you may have an upper limit
# at a point or a single detection limit for a whole field, it's the same thing
# (so note there is an association between limit and region)
# It may have suffix of bandpass
SRC_DET_SIG                       OBS_DETECT-SIGNIF              Detection Significance
# This is a property of a detected source
_DIFF                             OBS_DIFF                       Observations' offset, difference, or deviation
# Append to UCD of whatever is offset
OBS_POS_UNC_DRIFT                 OBS_DRIFT                      Positional drift during the observation
OBS_COV_BAND_FREQ                OBS_FREQUENCY                  Frequency of the observation
OBS_ID                            OBS_ID                         Observation identification
#  Comment: OBS_ mixes observation conditions and observed quantities.
SPEC_LINE_WIDTH_G                 OBS_LW                         Observed gaussian line-width
OBS_METHOD                        OBS_METHOD                     Observational Method/Technique
UNK                               OBS_OTHER                      Other Measurements
#  Comment: useless?
OBS_PARAM ?                       OBS_PARAM                      Additional Observational Parameters
OBS_PLATE ?                       OBS_PLATE                      Quantities related to measurements on plates
SRC_REG_DIA?                      OBS_PLATE_APERT              Plate (Circular) Aperture
SRC_REG_DIA                       OBS_PLATE_EXTENSION          Linear diameter of an object measured on a Plate
#  Comment: what does this really mean? Is this really different to a normal measured  diameter?
_MODEL_RATIO                      OBS_PRED/OBS                   Fraction of predicted to observed quantities
#  Comment: is this really different to FIT MEAS/THEORY?  Need to attach to whatever UCD is being measured. 
OBS_RUN                           OBS_RUN                        Observation run
SRC_REG_DIA                       OBS_SIZE                       Observed size
#  Comment: I doubt that OBS_SIZE and EXTENSION_DIAM are really different.
SRC_REG_DIA_DEC                   OBS_SIZE_DEC                 Observed size in declination
OBS_DISP                          OBS_SLIT                       Spectroscopic slit properties
# Applies to any dispersive system, not always a slit spectrograph?
SRC_DISP_Y                        OBS_SLIT_OFFSET              Slit offset respect to the nucleus of galaxy
#  Comment: this is really "position of source in slit coordinates".
OBS_DISP_THETA                    OBS_SLIT_ORIENT              Slit orientation
#  Comment: is this "PA of slit on sky" or "orientation of slit wrt source major axis"?
#  I suspect the former.
OBS_SPECTRUM?                     OBS_SPECTRUM                   Spectral observations
OBS_TYPE ?                        OBS_TYPE                       Type of observation
OBS_SITE                          OBSTY                            Data on Observatories
OBS_SITE_POS_ALT                  OBSTY_ALTITUDE                 Observatory Altitude
OBS_SITE_CODE                     OBSTY_CODE                     Observatory Code
OBS_SITE_NAME                     OBSTY_ID                       Observatory Identification/Name
ORBIT                             ORBIT                            Orbital elements (planets, double stars, galaxies)
ORBIT_ELT_NODE                    ORBIT_ASC-NODE                 Longitude of ascending node
ORBIT_COMET?                      ORBIT_COMETS                   Cometary orbit parameter
ORBIT_CONV_ANG?                   ORBIT_CONV-ANGLE               Convergence angle
ORBIT_PERI                        ORBIT_DISTANCE                 Distance, perihelion, or separation between components
ORBIT_DIST                        ORBIT_DISTANCE                 Distance, perihelion, or separation between components
# Here instantaneous distance
ORBIT_ELT_E                       ORBIT_ECCENTRICITY             Orbital eccentricity
ORBIT_ELONG                       ORBIT_ELONGATION               Elongation of radiant
ORBIT_FREQ                        ORBIT_FREQUENCY                Orbital frequency (orbital angular velocity)
ORBIT_ELT_M                       ORBIT_MEAN-ANOMALY             Mean anomaly
-                                 ORBIT_P-ASTRON                 Quantities related to the Periastron
ORBIT_ELT_AOP                     ORBIT_P-ASTRON_ARG           Periastron argument or longitude
ORBIT_ELT_TPERI                   ORBIT_P-ASTRON_DATE          Date of occurance of periastron
ORBIT_PERIDOT                     ORBIT_P-ASTRON_RATE          Rate of periastron advance
ORBIT_ELT_AOP                     ORBIT_P-HELION                 Perihelion argument or longitude
-                                 ORBIT_PARAM                    Orbital parameter
ORBIT_PERIOD                      ORBIT_PERIOD                   Orbital period
ORBIT_PDOT                        ORBIT_PERIOD_DERIVATIVE      Time derivative of orbital period
ORBIT_PHASEANG                    ORBIT_PHASE-ANGLE              Orbital phase angle
ORBIT_RV                          ORBIT_RV                       Orbital radial velocity properties
ORBIT_RV_AMP                      ORBIT_RV_S-AMPLITUDE         Semi amplitude of radial velocity curve
ORBIT_DIA_PROJ                    ORBIT_SEPARATION               Orbital Separation (angular distance)
ORBIT_DIA                         ORBIT_SIZE                     Orbital size
ORBIT_RADIUS                      ORBIT_SIZE_RADIUS            Orbital radius (binary stars)
ORBIT_ELT_A                       ORBIT_SIZE_SMAJ              Semi-major axis of the orbit
PHOT_                             PHOT                             Photometry, extending to several wavelength regimes (X to Radio)
PHOT_MAG_13C_                     PHOT_13C                       13 color system (Stellar Applications) GCPD#66
PHOT_COL(13C,33-52)               PHOT_13C_33-52               Color index 33-52 (13C)
PHOT_COL(13C,35-52)               PHOT_13C_35-52               Color index 35-52 (13C)
PHOT_COL(13C,37-52)               PHOT_13C_37-52               Color index 37-52 (13C)
PHOT_COL(13C,40-52)               PHOT_13C_40-52               Color index 40-52 (13C)
PHOT_COL(13C,45-52)               PHOT_13C_45-52               Color index 45-52 (13C)
PHOT_MAG(13C,52)                  PHOT_13C_52                  Magnitude 52 (13C)
PHOT_COL(13C,52-110)              PHOT_13C_52-110              Color index 52-110 (13C)
PHOT_COL(13C,52-58)               PHOT_13C_52-58               Color index 52-58 (13C)
PHOT_COL(13C,52-63)               PHOT_13C_52-63               Color index 52-63 (13C)
PHOT_COL(13C,52-72)               PHOT_13C_52-72               Color index 52-72 (13C)
PHOT_COL(13C,52-80)               PHOT_13C_52-80               Color index 52-80 (13C)
PHOT_COL(13C,52-86)               PHOT_13C_52-86               Color index 52-86 (13C)
PHOT_COL(13C,52-99)               PHOT_13C_52-99               Color index 52-99 (13C)
_ABS                              PHOT_ABS-MAG                   Absolute magnitude
_ABS                              PHOT_ABS-MAG_BAND            Absolute magnitude in a band, regardles of band
PHOT_MAG_BOL_ABS                  PHOT_ABS-MAG_BOL             Bolometric absolute magnitude
OBS_ATM_                          PHOT_ATM                       Earth Atmosphere Parameters Linked to Photometry
OBS_ATM_AIRMASS                   PHOT_ATM_AIRMASS             Air mass
OBS_ATM_EXT                       PHOT_ATM_EXT                 Atmospheric extinction coefficient
PHOT_BOL_                         PHOT_BOL                       Bolometric Quantities
PHOT_COL_BOL()                    PHOT_BOL_CORR                Bolometric correction
PHOT_FLUX_BOL                     PHOT_BOL_FLUX                Bolometric Flux
PHOT_LUM_BOL                      PHOT_BOL_LUMINOSITY          Bolometric luminosity
PHOT_MAG_BOL                      PHOT_BOL_MAG                 Bolometric magnitude
SRC_IMAGE_SLOPE                   PHOT_BRIGHTNESS-SLOPE          Spatial brightness distribution slope
# This is part of a spatial flux model for a source
#
PHOT_COL                          PHOT_CI                        Color index in unspecified system
PHOT_COL(,102-C220)               PHOT_CI_102-C220             Color index 102-C220
PHOT_COL(UNK,B-R)                 PHOT_CI_B-R                  Color index B-r
PHOT_COL(HALPHA,LINE-CONT)        PHOT_CI_ALPHA                Color index based on H-alpha line
PHOT_COL(HBETA,LINE-CONT)         PHOT_CI_BETA                 Color index beta or h-beta (not Stroemgren index)
PHOT_COL(BALMER,LINE-CONT)        PHOT_CI_BALMER               Color index using the Balmer lines Hgamma or higher
PHOT_COL(UNK,B-I)                 PHOT_CI_B-I                  Color index B-I from heterogeneous photometric systems
PHOT_COL(UNK,B-K)                 PHOT_CI_B-K                  Color index B-K from heterogeneous photometric systems
PHOT_COL(UNK,B-V)                 PHOT_CI_B-V                  Color index B-V in a non-conventional system
PHOT_COL(,CN-TiO)                 PHOT_CI_CN-TIO               Color index CN-TiO
PHOT_COL_CODE                     PHOT_CI_CODE                 Codes associated with color index
PHOT_COL_FRACT                    PHOT_CI_FRACT                Fractional color index
PHOT_COL(g,b-v)                   PHOT_CI_GB-GV                Color index gb-gv
PHOT_COL(g,u-b)                   PHOT_CI_GU-GB                Color index gu-gb
PHOT_COL(IRAS,)                   PHOT_CI_IR                   Various far IR color indices (e.g. with IRAS bands)
PHOT_COL(,IR-OPT)                 PHOT_CI_IR-OPT               Color index Infrared minus optical
PHOT_COL(,M-51)                   PHOT_CI_M-51                 Color index M-51
PHOT_COL(,R-HALPHA)               PHOT_CI_R-HALPHA             Color index R minus Halpha
PHOT_COL(,R-I)                    PHOT_CI_R-I                  Color index R-I
PHOT_COL(,U-B)                    PHOT_CI_U-B                  Color index u-B U-B
PHOT_COL(,U-R)                    PHOT_CI_U-R                  Color index u-r
PHOT_COL(UNK,UNK)                 PHOT_CI_UNDEF                Color index in unspecified system
PHOT_COL(,UV-OPT)                 PHOT_CI_UV-OPT               Color index uv minus Optical (UV-OPT)
PHOT_COL(,V-I)                    PHOT_CI_V-I                  Color index V-I (no standard system specified)
PHOT_COL(,V-R)                    PHOT_CI_V-R                  Color index V-R (no standard system specified)
?                                 PHOT_CLASS                     Classification of photometry
PHOT_COL_                         PHOT_COLOR                     Quantities related to color indices
PHOT_COL_EXCESS                   PHOT_COLOR_EXCESS            Color excess (not just E(B-V))
PHOT_RATE                         PHOT_COUNT-RATE                Count rates in several wavelength regimes
PHOT_RATE(UV)                     PHOT_COUNT-RATE_UV           Count rate in ultraviolet
PHOT_RATE(XR)                     PHOT_COUNT-RATE_X            Count rate in x-ray
PHOT_COUNTS                       PHOT_COUNTS                    Count measured in the detector
PHOT_COUNTS(IUE/SWP)              PHOT_COUNTS_IUE              Count from IUE
PHOT_COUNTS(IUE/LWP)              PHOT_COUNTS_IUE              Count from IUE
PHOT_COUNTS                       PHOT_COUNTS_MISC             Count measurement in the detector
PHOT_COUNTS(RADIO)                PHOT_COUNTS_RADIO          Counts in radio regime
PHOT_COUNTS(GAMMA)                PHOT_COUNTS_GAMMA          Count in gamma-ray regime
PHOT_RATE(GAMMA)                  PHOT_COUNT-RATE_GAMMA      Count rate of gamma photons
PHOT_COUNT_RATIO                  PHOT_COUNTS_RATIO          Ratio of photon counts, or relative counts.
PHOT_COUNTS(XR)                   PHOT_COUNTS_X                Counts in X-ray
PHOT_MAG(COUS)                    PHOT_COUS                      Cousins photometric system GCPD#54
PHOT_MAG(COUS,I)                  PHOT_COUS_I                  Cousins magnitude Ic 
PHOT_MAG(COUS,R)                  PHOT_COUS_R                  Cousins magnitude R COUS
PHOT_COL(COUS,R-I)                PHOT_COUS_R-I                Cousins R-I color index COUS
PHOT_COL(COUS,V-I)                PHOT_COUS_V-I                (Kron-)Cousins V-I color index COUS
PHOT_COL(COUS,V-R)                PHOT_COUS_V-R                (Kron-)Cousins V-R color index
PHOT_MAG(DDO,)                    PHOT_DDO                       DDO Photometric System GCPD#12
PHOT_COL(DDO,35-38)               PHOT_DDO_35-38               Color index 35-38 DDO
PHOT_COL(DDO,38-41)               PHOT_DDO_38-41               Color index 38-41 DDO
PHOT_COL(DDO,41-42)               PHOT_DDO_41-42               Color index 41-42 DDO
PHOT_COL(DDO,42-45)               PHOT_DDO_42-45               Color index 42-45 DDO
PHOT_COL(DDO,42-48)               PHOT_DDO_42-48               Color index 42-48 DDO
PHOT_COL(DDO,45-48)               PHOT_DDO_45-48               Color index 45-48 DDO
PHOT_COL(DDO,48-51)               PHOT_DDO_48-51               Color index 48-51 DDO
PHOT_MAG(DDO,48)                  PHOT_DDO_M48                 Magnitude m48 DDO
-                                 PHOT_DIFF                      Differences or differential quantities
PHOT_COL()_DIFF                   PHOT_DIFF_CI                 Difference in color index
PHOT_MAG()_DIFF                   PHOT_DIFF_MAG                Difference in or differential magnitude
PHOT_SB()_DIFF                    PHOT_DIFF_SB                 Difference in surface brightness
SRC_DIST_MAG                      PHOT_DIST-MOD                  Distance Modulus
# Distance modulus is not a brightness, it's a distance expressed in mag
PHOT_EXT                 PHOT_EXTINCTION                Extinction total to differential
PHOT_EXT_GAL              PHOT_EXTINCTION_GAL          Galactic extinction
PHOT_EXT_INT               PHOT_EXTINCTION_INT          Internal extinction
PHOT_EXT_ISM                   PHOT_EXTINCTION_ISM          Interstellar Absorption
PHOT_EXT_R                   PHOT_EXTINCTION_R            Insterstellar extinction (ratio total to differential)
PHOT_EXT_TOT                   PHOT_EXTINCTION_TOTAL        Total Extinction
PHOT_FLUENCE             PHOT_FLUENCE                   Fluence
PHOT_FLUX                 PHOT_FLUX                      Flux
PHOT_FLUXD                   PHOT_FLUX_DENSITY            Flux density
PHOT_FLUX(GAMMA)                   PHOT_FLUX_GAMMA              Flux in gamma rays
PHOT_FLUX(HALPHA)                   PHOT_FLUX_HALPHA             H-Alpha Flux
PHOT_FLUX(HBETA)                   PHOT_FLUX_HBETA              H Beta line flux
PHOT_FLUX(IRAS)                   PHOT_FLUX_IR                 IR flux (IRAS or others)
PHOT_FLUX(6 mu)                     PHOT_FLUX_IR_6             Flux density around 6 microns (e.g. ISO at 6.7 microns) close to M filter
PHOT_FLUX(9 mu)                     PHOT_FLUX_IR_9             Flux density around 9 microns (range 8-10)
PHOT_FLUX(IRAS12)                     PHOT_FLUX_IR_12            Flux density (IRAS) at 12 microns, or around 12 microns (ISO at 14.3)
PHOT_FLUX(IRAS25)                     PHOT_FLUX_IR_25            Flux density (IRAS) at 25 microns
PHOT_FLUX(3.5 mu)                     PHOT_FLUX_IR_3.5           Flux density at 3.5 microns
PHOT_FLUX(15 mu)                     PHOT_FLUX_IR_15            Flux density around 15 microns (e.g. 14.3um ISO)
PHOT_FLUX(IRAS60)                     PHOT_FLUX_IR_60            Flux density (IRAS) at 60 microns
PHOT_FLUX(IRAS100)                     PHOT_FLUX_IR_100           Flux density (IRAS) at 100 microns
PHOT_FLUX(170 mu)                     PHOT_FLUX_IR_170           Far infra-red Flux density around 170um (1750GHz)
PHOT_FLUX(300 mu)                     PHOT_FLUX_IR_300           Far infra-red Flux density around 300um (3000GHz)
PHOT_FLUX(FIR)                     PHOT_FLUX_IR_FAR           Far Infrared flux
PHOT_FLUX(H)                     PHOT_FLUX_IR_H             Flux Density in Johnson's H Band
PHOT_FLUX(L)                     PHOT_FLUX_IR_L             Flux Density in Johnson's L Band
PHOT_FLUX(UNK)                     PHOT_FLUX_IR_MISC          Miscellaneous IR fluxes
PHOT_FLUX_RATIO                   PHOT_FLUX_NORM               Normalized Flux, always dimensionless
PHOT_FLUX(OPTICAL)                   PHOT_FLUX_OPTICAL            Flux in the Optical (unspecified system and/or units)
PHOT_FLUX(RADIO)                   PHOT_FLUX_RADIO              Flux density at radio frequencies
PHOT_FLUX(22 MHz)                     PHOT_FLUX_RADIO_22M        Radio flux density around 22MHz (13.6m)
PHOT_FLUX(31 MHz)                     PHOT_FLUX_RADIO_31M        Radio flux density around 31MHz (9.7m)
PHOT_FLUX(43 MHz)                     PHOT_FLUX_RADIO_43M        Radio flux density around 43MHz (7.0m)
PHOT_FLUX(61 MHz)                     PHOT_FLUX_RADIO_61M        Radio flux density around 61MHz (4.9m)
PHOT_FLUX(87 MHz)                     PHOT_FLUX_RADIO_87M        Radio flux density around 87MHz (3.5m)
PHOT_FLUX(110 MHz)                     PHOT_FLUX_RADIO_110M       Radio flux density around 110MHz (2.7m)
PHOT_FLUX(150 MHz)                     PHOT_FLUX_RADIO_150M       Radio flux density around 150MHz (2.0m)
PHOT_FLUX(175 MHz)                     PHOT_FLUX_RADIO_175M       Radio flux density around 175MHz (1.7m)
PHOT_FLUX(250 MHz)                     PHOT_FLUX_RADIO_250M       Radio flux density around 250MHz (1.2m)
PHOT_FLUX(325 MHz)                     PHOT_FLUX_RADIO_325M       Radio flux density around 325MHz (92cm)
PHOT_FLUX(365 MHz)                     PHOT_FLUX_RADIO_365M       Radio flux density around 365MHz (82cm)
PHOT_FLUX(400 MHz)                     PHOT_FLUX_RADIO_400M       Radio flux density around 400MHz (75cm)
PHOT_FLUX(500 MHz)                     PHOT_FLUX_RADIO_500M       Radio flux density around 500MHz (60cm)
PHOT_FLUX(600 MHz)                     PHOT_FLUX_RADIO_600M       Radio flux density around 600MHz (50cm)
PHOT_FLUX(700 MHz)                     PHOT_FLUX_RADIO_700M       Radio flux density around 700MHz (43cm)
PHOT_FLUX(850 MHz)                     PHOT_FLUX_RADIO_850M       Radio flux density around 850MHz (35cm)
PHOT_FLUX(1 GHz)                     PHOT_FLUX_RADIO_1G         Radio flux density around 1GHz (30cm)
PHOT_FLUX(1.4 GHz)                     PHOT_FLUX_RADIO_1.4G       Radio flux density around 1.4GHz (21cm)
PHOT_FLUX(1.6 GHz)                     PHOT_FLUX_RADIO_1.6G       Radio flux density around (OH maser)
PHOT_FLUX(2.0 GHz)                     PHOT_FLUX_RADIO_2G         Radio flux density around 2GHz (15cm)
PHOT_FLUX(2.7 GHz)                     PHOT_FLUX_RADIO_2.7G       Radio flux density around 2.7GHz (11cm)
PHOT_FLUX(3.9 GHz)                     PHOT_FLUX_RADIO_3.9G       Radio flux density around 3.9GHz (7.7cm)
PHOT_FLUX(5.0 GHz)                     PHOT_FLUX_RADIO_5G         Radio flux density around 5GHz (6cm)
PHOT_FLUX(7.5 GHz)                     PHOT_FLUX_RADIO_7.5G       Radio flux density around 7.5GHz (4cm)
PHOT_FLUX(8.4 GHz)                     PHOT_FLUX_RADIO_8.4G       Radio flux density around 8.4GHz (3.6cm)
PHOT_FLUX(10.7 GHz)                     PHOT_FLUX_RADIO_10.7G      Radio flux density around 10.7GHz (2.8cm)
PHOT_FLUX(15.0 GHz)                     PHOT_FLUX_RADIO_15G        Radio flux density around 15GHz (2cm)
PHOT_FLUX(22.0 GHz)                     PHOT_FLUX_RADIO_22G        Radio flux density around (H2O maser)
PHOT_FLUX(36.0 GHz)                     PHOT_FLUX_RADIO_36G        Radio flux density around 36GHz (8.3mm)
PHOT_FLUX(43.0 GHz)                     PHOT_FLUX_RADIO_43G        Radio flux density around 43GHz (7.0mm)
PHOT_FLUX(63.0 GHz)                     PHOT_FLUX_RADIO_63G        Radio flux density around 63GHz (4.8mm)
PHOT_FLUX(90.0 GHz)                     PHOT_FLUX_RADIO_90G        Radio flux density around 90GHz (3.3mm)
PHOT_FLUX(125.0 GHz)                     PHOT_FLUX_RADIO_125G       Radio flux density around 125GHz (2.4mm)
PHOT_FLUX(180.0 GHz)                     PHOT_FLUX_RADIO_180G       Radio flux density around 180GHz (1.7mm)
PHOT_FLUX(250.0 GHz)                     PHOT_FLUX_RADIO_250G       Radio flux density around 250GHz (1.2mm)
PHOT_FLUX(350.0 GHz)                     PHOT_FLUX_RADIO_350G       Radio flux density around 350GHz (860um)
PHOT_FLUX(500.0 GHz)                     PHOT_FLUX_RADIO_500G       Radio flux density around 500GHz (600um)
PHOT_FLUX(700.0 GHz)                     PHOT_FLUX_RADIO_700G       Radio flux density around 700GHz (430um)
PHOT_FLUX(RADIO)                    PHOT_FLUX_RADIO_MISC       Miscellaneous Radio flux density
PHOT_FLUX(SiO-Maser)                     PHOT_FLUX_RADIO_SIO-MASER   SiO maser peak radio flux
PHOT_FLUX_RATIO                   PHOT_FLUX_RATIO              Flux ratio
PHOT_FLUX_RATIO                   PHOT_FLUX_REL                Relative (normalized) flux
PHOT_FLUX(UV)                   PHOT_FLUX_UV                 Ultraviolet flux (uv far-uv euv)
PHOT_FLUX(X)                   PHOT_FLUX_X                  X-ray flux
PHOT_MAG(GEN,)                 PHOT_GEN                       Geneva's photometric system GCPD#13
PHOT_COL(GEN,B-V)                    PHOT_GEN_B-V                 Geneva color index B-V (GEN)
PHOT_COL(GEN,B1-B)                   PHOT_GEN_B1-B                Geneva color index B1-B (GEN)
PHOT_COL(GEN,B2-B)                   PHOT_GEN_B2-B                Geneva color index B2-B (GEN)
PHOT_COL(GEN,G-B)                    PHOT_GEN_G-B                 Geneva color index G-B (GEN)
PHOT_COL(GEN,)                       PHOT_GEN_MISC                various geneva photometric color indices (and linear combinations)
PHOT_COL(GEN,U-B)                    PHOT_GEN_U-B                 Geneva color index U-B (GEN)
PHOT_MAG(GEN,V)                      PHOT_GEN_V                   Geneva magnitude filter V (GEN)
PHOT_COL(GEN,V-B)                    PHOT_GEN_V-B                 Geneva color index V-B (GEN)
PHOT_COL(GEN,V1-B)                   PHOT_GEN_V1-B                Geneva color index V1-B (GEN)
PHOT_MAG(GUNN,)                      PHOT_GUNN                      Gunn Photometric System GCPD#38
PHOT_MAG(GUNN,G)                     PHOT_GUNN_G                  Magnitude g (GUNN)
PHOT_COL(GUNN,G-I)                   PHOT_GUNN_G-I                Color index g-i (GUNN)
PHOT_COL(GUNN,G-R)                   PHOT_GUNN_G-R                Color index g-r (GUNN)
PHOT_MAG(GUNN,I)                     PHOT_GUNN_I                  Magnitude i (GUNN), also used in DENIS (0.82{mu}m)
PHOT_COL(GUNN,I-Z)                   PHOT_GUNN_I-Z                Color index I-z (GUNN)
PHOT_MAG(GUNN,R)                     PHOT_GUNN_R                  Magnitude R (GUNN)
PHOT_COL(GUNN,R-I)                   PHOT_GUNN_R-I                Color index R-I (GUNN)
PHOT_MAG(GUNN,V)                     PHOT_GUNN_V                  Magnitude v (GUNN)
PHOT_COL(GUNN,V-R)                   PHOT_GUNN_V-R                Color index V-R (GUNN)
PHOT_MAG(GUNN,Z)                     PHOT_GUNN_Z                  Magnitude z (GUNN)
PHOT_MAG(HEI,)                       PHOT_HEI                       Heidelberg s Photometric System (HEI)
PHOT_COL(HEI,U-B)                    PHOT_HEI_U-B                 Heidelberg photometry U-B (HEI)
PHOT_MAG(HIP,)                       PHOT_HIPPAR                    Hipparcos' photometry system
PHOT_MAG(HST,)                       PHOT_HST                       HST Photometric System (by filter name) (HST)
PHOT_MAG(HST,F1042M)                 PHOT_HST_F1042M              Magnitude F1042M (HST)
PHOT_MAG(HST,F140W)                  PHOT_HST_F140W               Magnitude M104W (HST)
PHOT_COL(HST,IR-IR)                  PHOT_HST_CI_IR               HST Color Index from IR filters, e.g. F140W-F210W
PHOT_COL(HST,U-B)                    PHOT_HST_CI_U-B              HST Color Index close to U-B, e.g. F336W-F430W
PHOT_MAG(HST,F170W)                  PHOT_HST_F170W               Magnitude F170W (HST)
PHOT_MAG(HST,F175W)                  PHOT_HST_F175W               Magnitude F175W (HST)
PHOT_MAG(HST,F220W)                  PHOT_HST_F220W               Magnitude F220W (HST)
PHOT_MAG(HST,F255W)                  PHOT_HST_F255W               Magnitude F255W (HST)
PHOT_MAG(HST,F275W)                  PHOT_HST_F275W               Magnitude F275W (HST)
PHOT_MAG(HST,F300W)                  PHOT_HST_F300W               Ultraviolet Magnitude F300W (HST)
PHOT_COL(HST,U-V)                    PHOT_HST_CI_U-V              HST Color Index close to U-V, e.g. F336W-F555W
PHOT_MAG(HST,F342W)                  PHOT_HST_F342W               Ultraviolet Magnitude in filters F330W or F342W (HST)
PHOT_MAG(HST,F430W)                  PHOT_HST_F430W               Ultraviolet magnitude F430W or F439W (HST)
PHOT_COL(HST,B-V)                    PHOT_HST_CI_B-V              HST Color Index close to B-V, e.g. F430W-F555W
PHOT_MAG(HST,F450W)                  PHOT_HST_F450W               Ultraviolet Magnitude F450W (HST)
PHOT_MAG(HST,F480LP)                 PHOT_HST_F480LP              Magnitude F480LP (HST)
PHOT_MAG(HST,F547M)                  PHOT_HST_F547M               Magnitude F547M (HST)
PHOT_MAG(HST,F555W)                  PHOT_HST_F555W               Magnitude F555W (HST)
PHOT_COL(HST,B-R)                    PHOT_HST_CI_B-R              HST Color Index close to B-R, e.g. F430W-F675W
PHOT_COL(HST,V-R)                    PHOT_HST_CI_V-R              HST Color Index close to V-R, e.g. F555W-F675W
PHOT_COL(HST,R-I)                    PHOT_HST_CI_R-I              HST Color Index close to R-I, e.g. F675W-F814W
PHOT_MAG(HST,F569W)                  PHOT_HST_F569W               Magnitude F569W (HST)
PHOT_MAG(HST,F606W)                  PHOT_HST_F606W               Magnitude F606W (HST)
PHOT_COL(HST,V-I)                    PHOT_HST_CI_V-I              HST Color Index close to V-I, e.g. F555W-F814W
PHOT_MAG(HST,F622W)                  PHOT_HST_F622W               Magnitude F622W (HST)
PHOT_MAG(HST,F675W)                  PHOT_HST_F675W               Magnitude F675W (HST)
PHOT_MAG(HST,F702W)                  PHOT_HST_F702W               Magnitude F702W (HST)
PHOT_MAG(HST,F725LP)                 PHOT_HST_F725LP              Magnitude F725LP (HST)
PHOT_MAG(HST,F785LP)                 PHOT_HST_F785LP              Magnitude F785LP (HST)
PHOT_MAG(HST,F791W)                  PHOT_HST_F791W               Magnitude F791W (HST)
PHOT_MAG(HST,F814W)                  PHOT_HST_F814W               Magnitude F814W (HST)
PHOT_MAG(HST,F850LP)                 PHOT_HST_F850LP              Magnitude F850LP (HST)
PHOT_MAG(HST,V)                      PHOT_HST_V                   Magnitude V (visual) HST (unspecified filter name)
PHOT_COL()                           PHOT_INDX                      Photometric index (usually in narrow bands)
PHOT_COL(,HI)                        PHOT_INDX_HI                 Neutral hydrogen HI photometry index
PHOT_MAG()_INT                       PHOT_INT-MAG                   Integrated or isophotal magnitudes
PHOT_MAG(,B)_INT                     PHOT_INT-MAG_B               Integrated total or isophotal blue magnitude
PHOT_MAG(,I)_INT                     PHOT_INT-MAG_I               Integrated, total or isophotal, I magnitude
PHOT_MAG(UNK,)_INT                   PHOT_INT-MAG_MISC            Miscellaneous Integrated or isophotal magnitudes
PHOT_MAG(,R)_INT                     PHOT_INT-MAG_R               Integrated, total or isophotal, R magnitude
PHOT_MAG(,I)_INT                     PHOT_INT-MAG_U               Integrated, total or isophotal, V magnitude
PHOT_MAG(,V)_INT                     PHOT_INT-MAG_V               Integrated, total or isophotal, V magnitude
PHOT_INTENSITY_                      PHOT_INTENSITY                 Intensity
PHOT_INTENSITY_ADU                   PHOT_INTENSITY_ADU           Intensity expressed in ADU (analog to digital units)
PHOT_INTENSITY_ADU                   PHOT_INTENSITY_ESTIMATED     Estimated intensity
# What in astronomy is *not* estimated? 
PHOT_INTENSITY_ADU?                  PHOT_INTENSITY_MISC          Miscellaneous Intensity
PHOT_INTENSITY_RATIO                 PHOT_INTENSITY_NORMALIZED     Normalized intensity
SRC_IMAGE_RADIAL_PROFILE_INTENSITY   PHOT_INTENSITY_PROFILE       Intensity profile
PHOT_INTENSITY_RATIO                 PHOT_INTENSITY_RATIO         Intensity ratio
PHOT_MAG(,IR)                        PHOT_IR                        Infrared magnitudes (not well inserted in photometric systems)
PHOT_COL(IRAS,IRAS12-IRAS25)         PHOT_IR_12-25                Infrared color index 12-25 (IRAS)
PHOT_COL(CO 2.29mu,LINE-CONT)        PHOT_IR_2.29                 CO band index magnitude at 2.29 micron
PHOT_COL(IRAS<IRAS25-IRAS60)         PHOT_IR_25-60                Infrared IRAS color index 25-60 microns
PHOT_MAG(,3.4 mu)                    PHOT_IR_3.4                  Infrared magnitude at 3.4 microns
PHOT_MAG(,4.2 mu)                    PHOT_IR_4.2                  Infrared magnitude at 4.2 micron
PHOT_MAG(,BrkGamma)                  PHOT_IR_BGAMMA               Infrared Bracket Gamma magnitude
PHOT_MAG(,K-10 mu)                   PHOT_IR_K-10                 Infrared color index K-10 (K minus 10 microns)
PHOT_MAG(,K-IRAS100)                 PHOT_IR_K-100                Infrared color index K-100 (K minus 100 microns)
PHOT_MAG(,K-IRAS12)                  PHOT_IR_K-12                 Infrared color index K-12 (K minus 12 microns)
PHOT_MAG(,K-IRAS25)                  PHOT_IR_K-25                 Infrared color index K-25 (K minus 25 microns)
PHOT_MAG(,K-IRAS60)                  PHOT_IR_K-60                 Infrared color index K-60 (K minus 60 microns)
PHOT_MAG(,L0 3.7mu)                  PHOT_IR_L0                   Infrared magnitude L at 3.7 micron
PHOT_MAG(,FIR)                       PHOT_IR_MAG                  Far infrared magnitude mfir (may include IRAS bands)
PHOT_MAG(,N1 8.38mu)                 PHOT_IR_N1:8.38              Infrared magnitude at 8.38 microns
PHOT_MAG(,N2 9.69mu)                 PHOT_IR_N2:9.69              Infrared magnitude at 9.69 microns
PHOT_MAG(,N3 12.89mu)                PHOT_IR_N3:12.89             Infrared magnitude at 12.89 microns
PHOT_MAG(AZ,N)                       PHOT_IR_N:10.4               Infrared magnitude N at 10.4 microns
PHOT_MAG(AZ,Q)                       PHOT_IR_Q:18.06              Infrared magnitude at 18.06 microns
PHOT_MAG(J,)                         PHOT_JHN                       Johnson's Photometric system GCPD#8 GCPD#9
PHOT_MAG(J,B)                        PHOT_JHN_B                   Johnson magnitude B (JHN), centered at 450nm
PHOT_COL(J,B-H)                      PHOT_JHN_B-H                 Johnson color index B-H (JHN)
PHOT_COL(J,B-I)                      PHOT_JHN_B-I                 Johnson color index B-I (JHN)
PHOT_COL(J,B-K)                      PHOT_JHN_B-K                 Johnson color index B-K (JHN)
PHOT_COL(J,B-K')                     PHOT_JHN_B-K'                Johnson color index B-K' (JHN)
PHOT_COL(J,B-R)                      PHOT_JHN_B-R                 Johnson color index B-R (JHN)
PHOT_COL(J,B-V)                      PHOT_JHN_B-V                 Johnson color index B-V (JHN)
PHOT_MAG(J,H)                        PHOT_JHN_H                   Johnson magnitude H (JHN), centered at 1.62{mu}m
PHOT_COL(J,H-K)                      PHOT_JHN_H-K                 Johnson color index H-K (JHN)
PHOT_MAG(J,I)                        PHOT_JHN_I                   Johnson magnitude I (JHN), centered at 0.87{mu}m
PHOT_COL(J,I-K)                      PHOT_JHN_I-K                 Johnson color index I-K (JHN)
PHOT_MAG(J,J)                        PHOT_JHN_J                   Johnson magnitude J (JHN), also used in DENIS (1.25{mu}m)
PHOT_COL(J,J-H)                      PHOT_JHN_J-H                 Johnson color index J-H (JHN)
PHOT_COL(J,J-K)                      PHOT_JHN_J-K                 Johnson color index J-K (JHN)
PHOT_MAG(J,K)                        PHOT_JHN_K                   Johnson magnitude K (JHN), and Ks filter in DENIS (2.15{mu}m)
PHOT_MAG(J,K')                       PHOT_JHN_K'                  Johnson magnitude K' (JHN)
PHOT_COL(J,K-L)                      PHOT_JHN_K-L                 Johnson color index K-L (JHN), centered at 3.5{mu}m
PHOT_COL(J,K-L')                     PHOT_JHN_K-L'                Johnson color index K-L' (JHN)
PHOT_COL(J,K-M)                      PHOT_JHN_K-M                 Johnson color index K-M (JHN), centered at 5.0{mu}m
PHOT_COL(J,K-N)                      PHOT_JHN_K-N                 Johnson color index K-N (JHN), centered at 9.0{mu}m
PHOT_COL(J,K-Q)                      PHOT_JHN_K-Q                 Johnson color index K-Q (JHN)
PHOT_MAG(J,L)                        PHOT_JHN_L                   Johnson magnitude L (JHN) (3.5{mu}m)
PHOT_MAG(J,L')                       PHOT_JHN_L'                  Johnson magnitude L' (JHN)
PHOT_COL(J,L-M)                      PHOT_JHN_L-M                 Johnson color index L-M (JHN)
PHOT_MAG(J,M)                        PHOT_JHN_M                   Johnson magnitude M (JHN) (5.0{mu}m)
PHOT_MAG(J,)                         PHOT_JHN_MISC                Johnson Photometric system GCPD#8 GCPD#9
PHOT_MAG(J,N)                        PHOT_JHN_N                   Johnson flux magnitude N (JHN) (9.0{mu}m)
PHOT_MAG(J,R)                        PHOT_JHN_R                   Johnson magnitude R (JHN)
PHOT_COL(J,R-H)                      PHOT_JHN_R-H                 Johnson color index R-H (JHN)
PHOT_COL(J,R-I)                      PHOT_JHN_R-I                 Johnson color index R-I (JHN)
PHOT_COL(J,R-K)                      PHOT_JHN_R-K                 Johnson color index R-K
PHOT_MAG(J,U)                        PHOT_JHN_U                   Johnson magnitude U (JHN), centered at 360nm
PHOT_COL(J,U-B)                      PHOT_JHN_U-B                 Johnson color index U-B (JHN)
PHOT_COL(J,U-V)                      PHOT_JHN_U-V                 Johnson color index U-V (JHN)
PHOT_MAG(J,V)                        PHOT_JHN_V                   Johnson-Cousins magnitude V (JHN), centered at 555nm
PHOT_COL(J,V-H)                      PHOT_JHN_V-H                 Johnson color index V-H (JHN)
PHOT_COL(J,V-I)                      PHOT_JHN_V-I                 Johnson color index V-I (JHN)
PHOT_COL(J,V-J)                      PHOT_JHN_V-J                 Johnson color index V-J (JHN)
PHOT_COL(J,V-K)                      PHOT_JHN_V-K                 Johnson color index V-K (JHN)
PHOT_COL(J,V-L)                      PHOT_JHN_V-L                 Johnson color index V-L (JHN)
PHOT_COL(J,V-M)                      PHOT_JHN_V-M                 Johnson color index V-M (JHN)
PHOT_COL(J,V-N)                      PHOT_JHN_V-N                 Johnson color index V-N (JHN)
PHOT_COL(J,V-R)                      PHOT_JHN_V-R                 Johnson color index V-R (JHN)
PHOT_MAG()_K_CORR                    PHOT_K-CORRECTION              K correction
PHOT_MAG(LCKWD,)                     PHOT_LCKWD                     Lockwood photometric system GCPD#30
PHOT_COL(LCKWD,81-78)                PHOT_LCKWD_81-78             Color index 81-78 LCKWD
PHOT_MAG(UNK,)                       PHOT_MAG                       Magnitude of uncertain origin
PHOT_MAG(,5007A)                     PHOT_MAG_5007                Magnitude O III lambda 5007
PHOT_MAG(,B)                         PHOT_MAG_B                   Blue B magnitude
PHOT_MAG(,BLUE)                      PHOT_MAG_BLUE                Set of UCDs describing magnitudes in the "blue" region of the spectrum
PHOT_MAG()_CENTER                    PHOT_MAG_CENTR               Central magnitude
PHOT_MAG()_CORR                      PHOT_MAG_CORR                Magnitude correction
PHOT_MAG()_DROP                      PHOT_MAG_DROP                Drop in magnitude
PHOT_MAG(EYE,V)                      PHOT_MAG_EYE                 Eye estimated magnitude
PHOT_MAG(,HI)                        PHOT_MAG_HI                  Magnitude associated with neutral hidrogen
PHOT_MAG(,I)                         PHOT_MAG_I                   Near-Infrared magnitude around 0.8um (undefined or non-conventional system)
PHOT_MAG(,J)                         PHOT_MAG_J                   Near-Infrared magnitude around 1.2um (undefined or non-conventional system)
PHOT_MAG(,H)                         PHOT_MAG_H                   Near-Infrared magnitude around 1.6um (undefined or non-conventional system)
PHOT_MAG(,K)                         PHOT_MAG_K                   Near-Infrared magnitude around 2.2um (undefined or non-conventional system)
PHOT_MAG(,IR)                        PHOT_MAG_IR                  Set of UCDs describing infra-red magnitudes (NIR + FIR)
PHOT_MAG()_LIMIT                     PHOT_MAG_LIMIT               Magnitude limit
PHOT_MAG()_OFFSET                    PHOT_MAG_OFFST               Magnitude offset
PHOT_MAG(,OPT)                       PHOT_MAG_OPTICAL             Optical magnitude
PHOT_MAG(,R)                         PHOT_MAG_R                   Red (R) magnitude
PHOT_MAG(,RED)                       PHOT_MAG_RED                 Set of UCDs describing red magnitudes (lambda_eff &lt; 7000A)
PHOT_MAG(,U')                        PHOT_MAG_U                   U' magnitude (3402 A)
PHOT_MAG(UNK,)                       PHOT_MAG_UNDEF               Magnitude of uncertain origin or different bands in same column
PHOT_MAG(,UV)                        PHOT_MAG_UV                  Various Ultraviolet magnitude (TD1, ANS, FAUST, ...)
PHOT_MAG(,V)                         PHOT_MAG_V                   Visual magnitude
PHOT_MAG(,V)                         PHOT_MAG_VISUAL              Set of UCDs describing any magnitude near the "visual". eg, johnson's V
PHOT_MAG(PG,)                        PHOT_PHG                       Photographic magnitude Quantities
# The traditional notation for a phot mag is m sub pg
PHOT_MAG(PG,B)                       PHOT_PHG_B                   Photographic blue magnitude B (includes the O magnitude of POSS)
PHOT_COL(PG,B-R)                     PHOT_PHG_B-R                 Photographic color index B-R (includes the O-E color index from POSS)
PHOT_COL(PG,B-V)                     PHOT_PHG_B-V                 Photographic color index B-V
PHOT_MAG(PG,Bj)                      PHOT_PHG_BJ                  Photographic magnitude Bj
PHOT_COL(PG,Bj-Rf)                   PHOT_PHG_BJ-RF               Photographic color index Bj-Rf
PHOT_MAG(PG,I)                       PHOT_PHG_I                   Photographic magnitude I
PHOT_MAG(PG,R)                       PHOT_PHG_R                   Photographic red band magnitude R (includes E magnitude from POSS)
PHOT_COL(PG,U-B)                     PHOT_PHG_U-B                 Photographic color index U-B
PHOT_MAG(PG,)                        PHOT_PHG_MAG                 Photographic magnitude in unidentified band
PHOT_MAG(PG,U)                       PHOT_PHG_U                   Ultraviolet photographic magnitude
PHOT_COL(PG,U-V)                     PHOT_PHG_U-V                 Photographic color index U-V (ultraviolet minus photovisual)
PHOT_COL(PG,R-I)                     PHOT_PHG_R-I                 Photographic color index R-I
PHOT_MAG(PG,V)                       PHOT_PHG_V                   Photographic visual magnitude V
PHOT_COL(PG,V-R)                     PHOT_PHG_V-R                 Photographic color index V-R (or g-r)
SRC_IMAGE_RADIAL_PROFILE             PHOT_PROFILE                   Light distribution profile
SRC_IMAGE_RADIAL_PROFILE_SERSIC      PHOT_PROFILE_PAR             Light distribution's profile parameter, like Sersic's index
PHOT_FLUX(RADIO)                     PHOT_RADIO                     all radio data
PHOT_FLUX(cm)                        PHOT_RADIO_CM                Radio data 10cm &gt; lambda &gt; 1cm
PHOT_FLUX(UHF)                       PHOT_RADIO_DECI-M            Radio data 100cm &gt; lambda &gt; 10cm
PHOT_FLUX(submm)                     PHOT_RADIO_HI-FREQ           Radio data &gt; 100 GHz
PHOT_FLUX(cm/mm)                     PHOT_RADIO_INT-FREQ          Radio data 1GHZ &lt; nu &lt; 100GHz
PHOT_FLUX(VHF/HF)                    PHOT_RADIO_LOW-FREQ          Radio data &lt; 1GHz
# the above three are approximate renditions using the proposed bands
PHOT_FLUX(VHF)                       PHOT_RADIO_METRIC            Radio data lambda &gt; 100cm
PHOT_FLUX(mm)                        PHOT_RADIO_MM                Radio data 1 to 9.9 mm
PHOT_FLUX(submm)                     PHOT_RADIO_SUBMM             Radio data &lt; 1mm
PHOT_MAG()_DERED                     PHOT_RF                        Reddening Free Photometric Parameters
PHOT_MAG(UNK)_DERED                  PHOT_RF_MISC                 Miscellaneous reddening-free photometric indices
PHOT_COL(,B-L)_DERED                 PHOT_RF_B-L                  B-L extinction free color
PHOT_COL(,B_U)_DERED                 PHOT_RF_B-U                  B-U extinction free color
PHOT_DERED_Q                         PHOT_RF_Q                    Reddening free Q parameter
PHOT_COL(STR,)_DERED                 PHOT_RF_STR                  Reddening free indices in the Stroemgren system
PHOT_COL(STR,C0)_DERED               PHOT_RF_STR_C0             Dereddened color index parameter c0
PHOT_COL(STR,M0)_DERED               PHOT_RF_STR_M0             Dereddened color index parameter m0
PHOT_COL(,U-W)_DERED                 PHOT_RF_U-W                  U-W extinction free color
PHOT_MAG(,V)_DERED                   PHOT_RF_V                    Reddening free magnitude v
PHOT_MAG(GEN,X)_DERED                PHOT_RF_X                    Reddening free geneva photometry parameter
PHOT_MAG(GEN,Y)_DERED                PHOT_RF_Y                    Reddening free geneva photometry parameter
PHOT_MAG(GEN,Z)_DERED                PHOT_RF_Z                    Reddening free geneva photometry parameter
PHOT_SB_                             PHOT_SB                        Surface Brightness quantities
PHOT_COL()_SB                        PHOT_SB_CI                   Color index differential surface brightness
PHOT_SB_CODE                         PHOT_SB_CODE                 Encoded Surface Brigthness
PHOT_SB_DIFF                         PHOT_SB_DIFF                 Differential surface brightness
PHOT_SB                              PHOT_SB_GENERAL              Surface Brightness (in general)
PHOT_SB_MAG(GUNN,G)                  PHOT_SB_GUNN-G               Surface Brightness in Gunn G
PHOT_SB_MAG(IRAS,IRAS100)            PHOT_SB_IR-100               Surface Brightness at 100 micron
PHOT_SB_MAG(J,)                      PHOT_SB_JHN                  Surface Brightness in Johnson's System
PHOT_SB_MAG(J,B)                     PHOT_SB_JHN_B              Surface Brightness in Johnson B
PHOT_SB_COL(J,B-R)                   PHOT_SB_JHN_B-R            Surface brightness Johnson's color B-R
PHOT_SB_MAG(J,H)                     PHOT_SB_JHN_H              Surface Brightness in Johnson H
PHOT_SB_MAG(J,I)                     PHOT_SB_JHN_I              Surface Brightness in Johnson I
PHOT_SB_MAG(J,J)                     PHOT_SB_JHN_J              Surface Brightness in Johnson J
PHOT_SB_MAG(J,K)                     PHOT_SB_JHN_K              Surface Brightness in Johnson K
PHOT_SB_MAG(J,K')                    PHOT_SB_JHN_K'             Surface Brightness in Johnson K'
PHOT_SB_MAG(J,R)                     PHOT_SB_JHN_R              Surface Brightness in Johnson R
PHOT_SB_MAG(J,U)                     PHOT_SB_JHN_U              Surface Brightness in Johnson U
PHOT_SB_COL(J,U-R)                   PHOT_SB_JHN_U-R            Surface Brightness color index U-R
PHOT_SB_MAG(J,V)                     PHOT_SB_JHN_V              Surface Brightness in johnson V
PHOT_SB_MAG()_LIMIT                  PHOT_SB_LIMIT                Surface Brightness Limit
PHOT_SB_MAG()_RATIO                  PHOT_SB_RATIO                Surface Brightness Ratio
PHOT_SB_MAG()_SKY                    PHOT_SB_SKY                  Sky Surface Brightness
PHOT_SB_MAG()_SD_TO_SB               PHOT_SD/B-BRIGHT               Surface Density To Brightness Ratio
PHOT_MAG(SDSS,)                      PHOT_SDSS                      Sloan Digital Sky Survey photometric system (1996AJ....111.1748F)
PHOT_MAG(SDSS,u')                    PHOT_SDSS_U                  Magnitude in u' or u* filter of Sloan Digital Sky Survey (1996AJ....111.1748F)
PHOT_MAG(SDSS,g')                    PHOT_SDSS_G                  Magnitude in g' filter of Sloan Digital Sky Survey (1996AJ....111.1748F)
PHOT_MAG(SDSS,r')                    PHOT_SDSS_R                  Magnitude in r' filter of Sloan Digital Sky Survey (1996AJ....111.1748F)
PHOT_MAG(SDSS,i')                    PHOT_SDSS_I                  Magnitude in i' filter of Sloan Digital Sky Survey (1996AJ....111.1748F)
PHOT_MAG(SDSS,z')                    PHOT_SDSS_Z                  Magnitude in z' filter of Sloan Digital Sky Survey (1996AJ....111.1748F)
SPEC_             ?                  PHOT_SPHOT                     Spectrophotometric quantities (narrow bands)
SPEC_CONT_GRAD                       PHOT_SPHOT_CONT-GRAD         Pseudo Continuum Gradient
SPEC_CORRFACTOR                      PHOT_SPHOT_CORR-FACT         Spectrophotometry Correction Factor
SPEC_FLUX()                          PHOT_SPHOT_FLUX              Flux measured (in physical units) in a narrow-band filter (optical, near-IR or near-UV)
SPEC_COL()                           PHOT_SPHOT_INDEX             Spectrophotometric Index defined by various combinations of narrow-band fluxes
SPEC_FLUX()                          PHOT_SPHOT_INT-ENERGY        Intrinsic Energy in Narrow Spectral Band
PHOT_MAG(SPHOT,)                     PHOT_SPHOT_MAG               Normalized magnitude in a narrow spectral band
PHOT_MAG(STR,)                       PHOT_STR                       Stroemgren Photometric System GCPD#4
PHOT_MAG(STR,B)                      PHOT_STR_B                   Stroemgren Magnitude b (STR)
PHOT_MAG(STR,B-R)                    PHOT_STR_B-R                 Stroemgren Color Index b-r (STR)
PHOT_MAG(STR,B-V)                    PHOT_STR_B-V                 Stroemgren Color Index b-v (STR)
PHOT_MAG(STR,B-Y)                    PHOT_STR_B-Y                 Stroemgren Color Index b-y (STR)
PHOT_COL(STR,C1)                     PHOT_STR_C1                  Stroemgren Color Index c1 (STR)
PHOT_COL(STR,HBETA)                  PHOT_STR_HBETA               Stroemgren Beta Value
PHOT_COL(STR,M1)                     PHOT_STR_M1                  Stroemgren Color Index m1 (STR)
PHOT_MAG(STR,U)                      PHOT_STR_U                   Stroemgren Magnitude u (STR)
PHOT_COL(STR,U-B)                    PHOT_STR_U-B                 Stroemgren Color Index u-b (STR)
PHOT_COL(STR,U-V)                    PHOT_STR_U-V                 Stroemgren Color Index u-v (STR)
PHOT_MAG(STR,V)                      PHOT_STR_V                   Stroemgren Magnitude v (STR)
PHOT_COL(STR,V-B)                    PHOT_STR_V-B                 Stroemgren Color Index v-b (STR)
PHOT_COL(STR,V-Y)                    PHOT_STR_V-Y                 Stroemgren Color Index v-y (STR)
PHOT_MAG(STR,Y)                      PHOT_STR_Y                   Stroemgren Magnitude y (STR)
OBS_COV_BAND_NAME                    PHOT_SYS-ID                    Identification of the Photometric System in use
-                                    PHOT_TRANSF                    Transformation of a Photometry, like conversion parameters between photometric systems
PHOT_TRANSF_PARAM?                   PHOT_TRANSF_PARAM              Parameter used in photometric transformations
PHOT_MAG()_OVER_SB                   PHOT_TOT-BRIGHT/B-BRIGHT       Total blue magnitude to Brightness ratio
PHOT_MAG(TYCHO,)                     PHOT_TYCHO                     Tycho Photometric System
PHOT_MAG(TYCHO,B)                    PHOT_TYCHO_B                 Blue Tycho Magnitude B_T_
PHOT_MAG(TYCHO,V)                    PHOT_TYCHO_V                 Visual Tycho Magnitude V_T_
PHOT_MAG(UBVR20,)                    PHOT_UBVR20                    UBVr20 Photometric System GCPD#69
PHOT_COL(UBVR20,B-V20)               PHOT_UBVR20_B-V20            Color Index B-V20 (UBVr20)
PHOT_COL(UBVR20,U-B20)               PHOT_UBVR20_U-B20            Color Index U-B20 (UBVr20)
PHOT_COL(UBVR20,V-R20)               PHOT_UBVR20_V-R20            Color Index V-r20 (UBVr20)
PHOT_MAG(UV,)                        PHOT_UV                        UV Magnitude Photometry number # &lt;= Lambda_central &lt; #+100
PHOT_MAG(UV,1300A)                   PHOT_UV_1300                 Far UV Magnitude 1300 to 1400 Angstrom UV
PHOT_MAG(UV,1400A)                   PHOT_UV_1400                 Far UV Magnitude 1400 to 1500 Angstrom UV
PHOT_MAG(UV,1500A)                   PHOT_UV_1500                 Far UV Magnitude 1500 to 1600 Angstrom UV
PHOT_MAG(UV,1600A)                   PHOT_UV_1600                 Far UV Magnitude 1600 to 1700 Angstrom UV
PHOT_MAG(UV,1700A)                   PHOT_UV_1700                 UV Magnitude 1700 to 1800 Angstrom UV
PHOT_MAG(UV,1800A)                   PHOT_UV_1800                 UV Magnitude 1800 to 1900 Angstrom UV
PHOT_MAG(UV,1900A)                   PHOT_UV_1900                 UV Magnitude 1900 to 2000 Angstrom UV
PHOT_MAG(UV,2000A)                   PHOT_UV_2000                 UV Magnitude 2000 to 2100 Angstrom UV
PHOT_MAG(UV,2200A)                   PHOT_UV_2200                 UV Magnitude 2200 to 2300 Angstrom UV
PHOT_MAG(UV,2300A)                   PHOT_UV_2300                 UV Magnitude 2300 to 2400 Angstrom UV
PHOT_MAG(UV,2400A)                   PHOT_UV_2400                 Near UV Magnitude 2400 to 2500 Angstrom UV
PHOT_MAG(UV,2500A)                   PHOT_UV_2500                 Near UV Magnitude 2500 to 2600 Angstrom UV
PHOT_MAG(UV,2700A)                   PHOT_UV_2700                 Near UV Magnitude 2700 to 2800 Angstrom UV
PHOT_MAG(UV,2945A)                   PHOT_UV_2945                 Near UV Magnitude 2900 to 3000 Angstrom UV
PHOT_MAG(UV,3150A)                   PHOT_UV_3150                 Near UV Magnitude 3100 to 3200 Angstrom UV
PHOT_MAG(UV,3300A)                   PHOT_UV_3300                 Near UV Magnitude 3300 to 3400 Angstrom UV
PHOT_MAG(UV,4250A)                   PHOT_UV_4250                 Near UV Magnitude 4200 to 4300 Angstrom UV
PHOT_COL(UV,)                        PHOT_UV_COLOR                Ultraviolet Color Index (no bands specified)
PHOT_MAG(UV,)                        PHOT_UV_GENERAL              UV Magnitude unspecified band
PHOT_MAG(UVBGRI,)                    PHOT_UVBGRI                    UVBGRI Photometric System GCPD#6
PHOT_MAG(UVBGRI,B)                   PHOT_UVBGRI_B                Filter Blue Magnitude UVBGRI
PHOT_MAG(UVBGRI,G)                   PHOT_UVBGRI_G                Filter Green Magnitude UVBGRI
PHOT_MAG(UVBGRI,I)                   PHOT_UVBGRI_I                Filter Infra Magnitude UVBGRI
PHOT_MAG(UVBGRI,R)                   PHOT_UVBGRI_R                Filter Red Magnitude UVBGRI
PHOT_MAG(UVBGRI,U)                   PHOT_UVBGRI_U                Filter Ultra Magnitude UVBGRI
PHOT_MAG(UVBGRI,V)                   PHOT_UVBGRI_V                Filter Violet Magnitude UVBGRI
PHOT_MAG(VIL,)                       PHOT_VIL                       Vilnius Photometric System GCPD#21
PHOT_COL(VIL,P-X)                    PHOT_VIL_P-X                 Vilnius Color Index p-x (VIL)
PHOT_COL(VIL,S-V)                    PHOT_VIL_S-V                 Vilnius Color Index s-v (VIL)
PHOT_COL(VIL,U-P)                    PHOT_VIL_U-P                 Vilnius Color Index u-p (VIL)
PHOT_COL(VIL,U-V)                    PHOT_VIL_U-V                 Vilnius Color Index u-v (VIL)
PHOT_MAG(VIL,V)                      PHOT_VIL_V                   Magnitude V Vilnius (VIL)
PHOT_COL(VIL,V-P)                    PHOT_VIL_V-P                 Vilnius Color Index v-p (VIL)
PHOT_COL(VIL,V-S)                    PHOT_VIL_V-S                 Vilnius Color Index v-s (VIL)
PHOT_COL(VIL,V-W)                    PHOT_VIL_V-W                 Vilnius Color Index v-w
PHOT_COL(VIL,V-X)                    PHOT_VIL_V-X                 Vilnius Color Index v-x (VIL)
PHOT_COL(VIL,V-Z)                    PHOT_VIL_V-Z                 Vilnius Color Index v-z (VIL)
PHOT_MAG(VIL,X)                      PHOT_VIL_X                   Magnitude X Vilnius (VIL)
PHOT_COL(VIL,X-Y)                    PHOT_VIL_X-Y                 Vilnius Color Index x-y (VIL)
PHOT_COL(VIL,Y-Z)                    PHOT_VIL_Y-Z                 Vilnius Color Index y-z (VIL)
PHOT_COL(VIL,Z-V)                    PHOT_VIL_Z-V                 Vilnius Color Index z-v (VIL)
PHOT_MAG(WASH,)                      PHOT_WASH                      Washington Photometric System GCPD#48
PHOT_COL(WASH,C-M)                   PHOT_WASH_C-M                Washington Color Index c-m (WASH)
PHOT_COL(WASH,C-T1)                  PHOT_WASH_C-T1               Washington Color Index c-t1 (WASH)
PHOT_COL(WASH,D)                     PHOT_WASH_D                  Washington Abundance Indicator D (WASH)
# Is the abundance indicator basically a color?
PHOT_COL(WASH,M-T1)                  PHOT_WASH_M-T1               Washington Color Index m-t1 (WASH)
PHOT_COL(WASH,M-T2)                  PHOT_WASH_M-T2               Washington Color Index m-t2 (WASH)
PHOT_MAG(WASH,T1)                    PHOT_WASH_T1                 Washington Magnitude t1 (WASH)
PHOT_MAG(WLRV,)                      PHOT_WLRV                      Walraven Photometric System GCPD#11
PHOT_MAG(WLRV,B)                     PHOT_WLRV_B                  Walraven Magnitude (flux intensity) B (WLRV)
PHOT_COL(WLRV,B-L)                   PHOT_WLRV_B-L                Walraven Color Index B-L (WLRV)
PHOT_COL(WLRV,B-U)                   PHOT_WLRV_B-U                Walraven Color Index B-U (WLRV)
PHOT_COL(WLRV,B-W)                   PHOT_WLRV_B-W                Walraven Color Index B-W (WLRV)
PHOT_MAG(WLRV,L)                     PHOT_WLRV_L                  Walraven Magnitude (Flux Intensity) L (WLRV)
PHOT_MAG(WLRV,U)                     PHOT_WLRV_U                  Walraven Magnitude (Flux Intensity) U (WLRV)
PHOT_COL(WLRV,U-W)                   PHOT_WLRV_U-W                Walraven Color Index U-W (WLRV)
PHOT_MAG(WLRV,V)                     PHOT_WLRV_V                  Walraven Magnitude (Flux Intensity) V (WLRV)
PHOT_COL(WLRV,V-B)                   PHOT_WLRV_V-B                Walraven Color Index V-B (WLRV)
PHOT_MAG(WLRV,W)                     PHOT_WLRV_W                  Walraven Magnitude (Flux Intensity) W (WLRV)
PHOT_MAG()_ZERO                      PHOT_ZP                        Zero point coefficient for the photometric system
PHYS_                                PHYS                             Physical Quantities
MED_MATTER_ABUND_                    PHYS_ABUND                     Abundances
MED_MATTER_ABUND()                   PHYS_ABUND_MISC              Abundance (other than H, He, and Fe)
MED_MATTER_ABUND_X                   PHYS_ABUND_X                 Hydrogen Abundance (X)
MED_MATTER_ABUND_Y                   PHYS_ABUND_Y                 Helium Abundance (Y)
MED_MATTER_ABUND_Z                   PHYS_ABUND_Z                 Metal Abundance Z (metallicity)
MED_MATTER_ABUND_FEH                 PHYS_ABUND_[FE/H]            Fe to H Abundance (Metallicity)
OBJ_ALBEDO                           PHYS_ALBEDO                    Albedo
OBJ_ANGMOM                           PHYS_ANG-MOMENTUM              Angular Momentum
-                                    PHYS_AREA                      Physical quantities related to Area
PHYS_PARTICLE_XSECT                  PHYS_AREA_CR-SECT            Cross Section
?                                    PHYS_AREA_GENERAL            Area (in general)
PHYS_BODY_FLATTENING                 PHYS_AXIS-RATIO                Axis Ratio
-                                    PHYS_BRIGHT                    Object's brightness quantities
SRC_VAR_BRIGHT                       PHYS_BRIGHT_CHANGE           Brightness Change
# This is the change in an astronomical source...
-                                   PHYS_COLUMN                    Line Of Sight Column Properties
LOS_NUMBER_COL                      PHYS_COLUMN_DENSITY          Column Density (by number of particles)
LOS_MASS_COL                        PHYS_COLUMN_MASS-DENSITY     Mass Column Density
SRC_COMPACTNESS                     PHYS_COMPACTNESS               Compactness Indicator
SRC_CONCENT                         PHYS_CONCENT                   Concentration Indicators
SRC_CONCENT_INDEX?                  PHYS_CONCENT_INDEX           Concentration Index
MED_MATTER_DENSITY                  PHYS_DENSITY                   Density (various flavours)
MED_MATTER_NE                       PHYS_DENSITY_ELECT           Electron Density
MED_ENERGY_DENSITY                  PHYS_DENSITY_ENERGY          Energy Density
MED_MATTER_DENSITY                  PHYS_DENSITY_MASS            Mass Density
MED_MATTER_SURF_DENSITY             PHYS_DENSITY_MASS_SURF     Surface Mass-Density
MED_MATTER_MASSVOL_DENSITY?         PHYS_DENSITY_MASS_VOL      Volume Mass-Density
MED_MATTER_NUM_DENSITY              PHYS_DENSITY_NUMBER          Number Density
MED_MATTER_DENSITY_RATIO            PHYS_DENSITY_RATIO           Density Ratio
MED_MATTER_SURF_NUM_DENSITY         PHYS_DENSITY_SURFACE         Surface Density
LOS_DISP_MEASURE                    PHYS_DISP-MEASURE              Dispersion Measure
OBJ_DISTANCE                        PHYS_DISTANCE                  Distance and related quantities
OBJ_DISTANCE_DIFF                   PHYS_DISTANCE_DIFF           Distance Difference
OBJ_DISTANCE_RATIO                  PHYS_DISTANCE_NORM           Relative or Normalized Distance
OBJ_DISTANCE_PROJ                   PHYS_DISTANCE_PROJ           Projected Distance
OBJ_DISTANCE_RATIO                  PHYS_DISTANCE_RATIO          Distance Fraction or Ratio
OBJ_DISTANCE_RATIO                  PHYS_DISTANCE_RELATIVE       Relative Distance
OBJ_DISTANCE                        PHYS_DISTANCE_TRUE           Distance (true, linear distance)
ORBIT_ELT_E                         PHYS_ECCENTRICITY              Eccentricity
MED_FIELDS_ELEC                     PHYS_ELEC-FIELD                Electric (electrostatic) Field
OBJ_ELLIPTICITY                     PHYS_ELLIPTICITY               Ellipticity (1-b/a)
MED_MATTER_EMMEASURE                PHYS_EM-MEASURE                Emission Measure
_ENERGY                             PHYS_ENERGY                    Energy and related quantities
?                                   PHYS_ENERGY_CONTRIB          Energy Contribution
?                                   PHYS_ENERGY_GENERAL          Energy in general
SPEC_SLOPE_ENERGY ?                 PHYS_ENERGY_INDEX            Energy Index
PHYS_AT_ION_ENERGY                  PHYS_ENERGY_ION              Ion Energy
MED_MATTER_COOLING_RATE             PHYS_ENERGY_LOSS-RATE        Energy Loss Rate
SPEC_PHOTON_ENERGY                  PHYS_ENERGY_X                X-ray or Gamma-ray Energy
# WHy do we care it is X?
?                                   PHYS_EXCITATION                Excitation in the Context of Ionizing Photons
MED_MATTER_EXCITE_PARAM             PHYS_EXCITATION_PARAM        Excitation Parameter
OBJ_MATTER_MDOT         ?           PHYS_FLOW                      Matter Flow or Outflows Quantities
MED_MATTER_FLOW_POLARITY            PHYS_FLOW_POLARITY           Flow Polarity
-                                   PHYS_GRADIENT                  Gradients (usually on galaxy context)
MED_MATTER_CHEM_GRADIEN             PHYS_GRADIENT_CHEMICAL       Chemical Gradient
PHOT_COL()_GRADIENT                 PHYS_GRADIENT_CI             Color Index Gradient
_GRADIENT                           PHYS_GRADIENT_GENERAL        General gradients (usually on galaxy context)
PHOT_SB_MAG()_GRADIENT              PHYS_GRADIENT_SB             Surface Brightness Gradient
MED_MATTER_TEMP_GRADIENT            PHYS_GRADIENT_TEMP           Temperature Gradient
MED_MATTER_VEL_GRADIENT             PHYS_GRADIENT_VELOCITY       Velocity Gradient
-                                   PHYS_GRAVITY                   Gravity and related properties
MED_GRAVITY_POTL                    PHYS_GRAVITY_POTENTIAL       Gravitational Potential
MED_GRAVITY_PRESS                   PHYS_GRAVITY_PRESS           Gravitational pressure
OBJ_SURFACE_GRAVITY                 PHYS_GRAVITY_SURFACE         Surface Gravity
_HEIGHT                             PHYS_HEIGHT                    Height or depth (usually in an atmospheric context)
LOS_IMPACT_PAR                      PHYS_IMPACT-PAR                Impact Parameter
MED_RAD_IC_BEAMING                  PHYS_INV-COMPTON-BEAM-FACT       Inverse Compton Effect Beam Factor
MED_MATTER_IONIZATION               PHYS_IONIZATION                Ionization quantities (in stellar/interstellar environments)
MED_MATTER_IONPARAM                 PHYS_IONIZATION_PARAM        Ionization Parameter
MED_RAD_FLUX_N_IONIZING             PHYS_IONIZATION_PHOTONS      Ionizing Photons
MED_RAD_FLUX_FRAC_IONIZING          PHYS_IONIZATION_PHOTONS_RATIO   Ionizing Photon Ratio
MED_RAD_FLUX_N_IONIZING?            PHYS_IONIZATION_PHOTONS_TOTAL   Total ionizing Photons
_LENGTH                             PHYS_LENGTH                    Length related quantities
_LENGTH_RATIO?                      PHYS_LENGTH_RATIO            Length Ratio
-                                   PHYS_LIMB-DARK                 Limb Darkening Phenomena
SRC_LIMBDARK_COEFF                  PHYS_LIMB-DARK_COEFF         Limb Darkening Coefficient
SRC_LUM()                           PHYS_LUMINOSITY                Luminosity, in different bands and types
SRC_LUM(B)                          PHYS_LUMINOSITY_B            Luminosity in blue light
SRC_LUM(CIV)                        PHYS_LUMINOSITY_CARBON       Carbon luminosity
SRC_LUM(CONT)                       PHYS_LUMINOSITY_CONTINUUM     Continuum luminosity
SRC_LUM_DENSITY                     PHYS_LUMINOSITY_DENSITY      Luminosity density
_LUM                                PHYS_LUMINOSITY_GENERAL      Luminosity in general
SRC_LUM(H2O MASER)                  PHYS_LUMINOSITY_H2O          Water maser luminosity
SRC_LUM(HALPHA)                     PHYS_LUMINOSITY_HALPHA       H alpha luminosity
SRC_LUM(HBETA)                      PHYS_LUMINOSITY_HBETA        H beta luminosity
SRC_LUM(HE) ?                       PHYS_LUMINOSITY_HE           Helium luminosity
SRC_LUM(H?) ?                       PHYS_LUMINOSITY_HYDROG       Hydrogen luminosity
SRC_LUM(IR)                         PHYS_LUMINOSITY_IR           Infrared luminosity
SRC_LUM(IRAS100)                    PHYS_LUMINOSITY_IR_100     Luminosity at 100 micron
SRC_LUM(IRAS12)                     PHYS_LUMINOSITY_IR_12      Luminosity at 12 micron
SRC_LUM(IRAS25)                     PHYS_LUMINOSITY_IR_25      Luminosity at 25 micron
SRC_LUM(IRAS60)                     PHYS_LUMINOSITY_IR_60      Luminosity at 60 micron
SRC_LUM(IR)                         PHYS_LUMINOSITY_IR_MISC    Infrared luminosity in general
SRC_LUM()_MASER                     PHYS_LUMINOSITY_MASER        Maser luminosity
SRC_NU_LUM                          PHYS_LUMINOSITY_NU           Neutrino luminosity
SRC_LUM(OH)                         PHYS_LUMINOSITY_OH           OH luminosity
SRC_IMAGE_LUM()_PROFILE             PHYS_LUMINOSITY_PROFILE      Luminosity profile
SRC_LUM(R)                          PHYS_LUMINOSITY_R            Luminosity in red light
SRC_LUM(RADIO)                      PHYS_LUMINOSITY_RADIO        Radio luminosity
SRC_LUM()_RATIO                     PHYS_LUMINOSITY_RATIO        Luminosity ratio
SRC_LUM()_SURFACE                   PHYS_LUMINOSITY_SURFACE      Surface luminosity
SRC_LUM(UV)                         PHYS_LUMINOSITY_UV           Ultraviolet luminosity
SRC_LUM(UV_LYA)                     PHYS_LUMINOSITY_UV_LYA     Ionizing ultraviolet luminosity in lyman alpha
SRC_LUM(UV)                         PHYS_LUMINOSITY_UV_MISC    Ultraviolet luminosity
SRC_LUM(XR)                         PHYS_LUMINOSITY_X            X-ray luminosity
MED_FIELDS_MAG                      PHYS_MAG-FIELD                 Magnetic Field
-                                   PHYS_MASS                      Mass and related quantities
?                                   PHYS_MASS_ABS-COEFF          Mass Absorption Coefficient
MED_MATTER_MASS_FLUX                PHYS_MASS_FLUX               Mass flux or flow
OBJ_MASS_RATIO?                     PHYS_MASS_FRACTIONAL         Fractional Mass
OBJ_MASS_FN                         PHYS_MASS_FUNCTION           Function of mass, typically in spectroscopic binaries (M2*sini)^3^/(M1+M2)^2^
OBJ_MDOT                            PHYS_MASS_LOSS               Mass Loss
OBJ_MASS                            PHYS_MASS_MISC               Mass
OBJ_MASS_RATIO                      PHYS_MASS_RATIO              Mass Ratio
PHYS_AT_MASS_YIELD                  PHYS_MASS_YIELD              Mass yield associated to a given element
OBJ_MASS_LIGHT_RATIO                PHYS_MASS/LIGHT              Mass to Light Ratio
MED_RAD_OPACITY                     PHYS_OPACITY                   Opacity
MED_RAD_TAU                         PHYS_OPTICAL-DEPTH             Optical Depth
MED_MATTER_OUTFLOW                  PHYS_OUTFLOW                   Outflows related quantities
MED_MATTER_OUTFLOW_PARAM            PHYS_OUTFLOW_PARAM           Outflow Parameter Factor
-                                   PHYS_PLASMA                    Plasma Physics Parameters
MED_MATTER_PLASMA_PARAM             PHYS_PLASMA_PARAM            Plasma Physics Parameters
MED_MATTER_PLASMA_GAUNT             PHYS_PLASMA_GAUNT-FACT       Plasma Physics Gaunt Factor
_PRESS                              PHYS_PRESS                     Pressure and related quantities
MED_MATTER_PRESS_E                  PHYS_PRESS_ELECT             Electron Pressure
MED_MATTER_PRESS_GAS                PHYS_PRESS_GAS               Gas Pressure
OBJ_RADIUS_MAXROT                   PHYS_RAD-MAX-ROT-VEL           Radius at which maximum rotational velocity occurs
MED_MATTER_ACCEL_RAD                PHYS_RADIATIVE-ACCEL           Radiative Acceleration
OBJ_REFLECTANCE?                    PHYS_REFLECTANCE               Reflectance
MED_MATTER_REFRACT-INDX             PHYS_REFRACT-INDX              Refraction Index
MED_RAD_ROTN_MEASURE                PHYS_ROTATION-MEASURE          Rotation Measure
_SCALE                              PHYS_SCALE                     Quantities Representing a Scale
_SCALE_HEIGHT                       PHYS_SCALE_HEIGHT            Scale Height
_SCALE_LENGTH                       PHYS_SCALE_LENGTH            Scale Length
OBJ_SEPARATION                      PHYS_SEPARATION                Pair Separation (in non-angular units)
-                                   PHYS_SIZE                      Size (in non-angular units)
OBJ_DIA                             PHYS_SIZE_DIAM               Diameter
OBJ_DIA_MAJ                         PHYS_SIZE_MAJ                Size (diameter) measured along the major axis
OBJ_DIA_MIN                         PHYS_SIZE_MIN                Size (diameter) measured along the minor axis
OBJ_RADIUS                          PHYS_SIZE_RADIUS             Radius and related quantities
OBJ_RADIUS                          PHYS_SIZE_RADIUS_GENERAL   Linear Radius
OBJ_RADIUS_RATIO                    PHYS_SIZE_RADIUS_NORM      Normalized Radius
OBJ_RADIUS_RATIO?                   PHYS_SIZE_RATIO              Size Ratio
OBJ_RADIUS_MAJ                      PHYS_SIZE_SMAJ               Size Of The Semi Major Axis
OBJ_RADIUS_MAJ                      PHYS_SIZE_SMAJ_GENERAL     Size Of The Semi Major Axis
OBJ_RADIUS_MAJ_RATIO                PHYS_SIZE_SMAJ_NORM        Normalized Size of the Major Axis
OBJ_RADIUS_MIN                      PHYS_SIZE_SMIN               Size of the Semi Minor Axis
OBJ_RADIUS_MIN_RATIO                PHYS_SIZE_SMIN_NORM        Normalized Size of the Minor Axis
-                                   PHYS_STAR-FORM                 Star Formation Related Quantities
POP_SFR                             PHYS_STAR-FORM_RATE          Star Formation Rate
-                                   PHYS_SUN                       Solar Related Quantities
-                                   PHYS_SUN_ATM                 Quantities Related to the Solar Atmosphere
OBJ(SUN)_ATM_ABSCOEFF               PHYS_SUN_ATM_ABS-COEFF     Solar Spectral Absorption Coefficient
OBJ(SUN)_ATM_PARAM                  PHYS_SUN_ATM_PARAM         Solar Atmosphere Parameter
?                                   PHYS_SUN_HARM/FUN-BAND-FREQ-RATIO     Harmonic to Fundamental Frequency Ratio
?                                   PHYS_TANG-DOPPLER-FACT         Tangential Doppler Effect Factor
_TEMP                               PHYS_TEMP                      Temperature and related quantities
_TEMP_DIFF                          PHYS_TEMP_DIFF               Temperature Amplitude or difference
SPEC_TEMP_EFF                       PHYS_TEMP_EFFEC              Effective Temperature
MED_MATTER_TEMP_E                   PHYS_TEMP_ELECT              Electron Temperature
PHYS_AT_TEMP_EXCIT                  PHYS_TEMP_EXCIT              Excitation Temperature
MED_MATTER_TEMP_FF                  PHYS_TEMP_F-F                Free-free or Bremsstrahlung Temperature
MED_MATTER_TEMP_KINETIC             PHYS_TEMP_KINETIC            Kinetic Temperature
MED_MATTER_TEMP                     PHYS_TEMP_MISC               Temperature in general
MED_MATTER_TEMP                     PHYS_TEMP_PLASMA             Plasma Temperature
MED_MATTER_TEMP_THETA               PHYS_TEMP_THETA              Effective temperature theta (5040/Teff)
MED_MATTER_TEMP                     PHYS_TEMP_XRAY               X Ray temperature
OBJ_TYPE                            PHYS_TYPE                      Type of Phenomenon or Event
_VOLUME                             PHYS_VOLUME                    Volume
_VOLUME_RATIO                       PHYS_VOLUME_RATIO            Volume Ratio
OBJ_WIND                            PHYS_WIND                      Stellar or Solar Wind Properties
OBJ_WIND_LUM                        PHYS_WIND_LUMINOSITY         Wind Luminosity
SPEC_POL                            POL                              Polarization Related Quantities
SPEC_POL_FRAC                       POL_DEGREE                     Degree of Polarization
SPEC_POL_FRAC_CIRC                  POL_DEGREE_CIRC              Degree of Circular polarization
SPEC_POL_FRAC_LIN                   POL_DEGREE_LINEAR            Degree of Linear polarisation
SPEC_POL_FRAC                       POL_DEGREE_MISC              Degree of Polarization (unspecified type)
SPEC_FLUX()_POL                     POL_FLUX                       Polarized Flux (two flavours)
SPEC_FLUX()_POL_LCP                 POL_FLUX_LCP                 Left Circular Polarization Flux
SPEC_FLUX()_POL_LIN                 POL_FLUX_LINEAR              Linearly polarized flux density
SPEC_FLUX()_POL_RCP                 POL_FLUX_RCP                 Right Circular Polarization Flux
SPEC_POL_INDEX                      POL_INDEX                      Polarization Index
SPEC_POL_LAMBDAMAX                  POL_LAMBDA-MAX                 Maximum Polarization's Wavelength
SPEC_POL_LIN_TO_CIRC                POL_LINEAR/CIRC                Ratio of Linear to Circular Polarization
SPEC_POL_PA()                       POL_PA                         Position Angle of the Polarization vector
SPEC_POL_PA(EQ)                     POL_PA_EQ                    Position Angle in Equatorial Coordinates of the Polarization vector
SPEC_POL_PA(GAL)                    POL_PA_GAL                   Position Angle in Galactic Coordinates of the Polarization vector
SPEC_POL_PA(*POS_FRAME)             POL_PA_MISC                  Vector's Position Angle in unspecified coordinate system
SPEC_POL_SENSE                      POL_SENSE                      Sense Of Polarization
SPEC_POL_SLOPE                      POL_SLOPE                      Polarimetry Slope
SPEC_POL_STOKES_                    POL_STOKES                     Polarization Stokes Parameters
SPEC_POL_STOKES_I                   POL_STOKES_I                   Stokes parameter I (total power)
SPEC_POL_STOKES_Q                   POL_STOKES_Q                   Stokes Parameter Q (absolute, or relative Q/I) [horizontal/vertical component]
SPEC_POL_STOKES_U                   POL_STOKES_U                   Stokes Parameter U (absolute, or relative U/I) [diagonal component]
SPEC_POL_STOKES_V                   POL_STOKES_V                   Stokes Parameter V (absolute, or relative V/I) [circular component]
_POS_                               POS                              Position Related Quantities
OBJ_POS_ANG_ ?                      POS_ANG                        Angular Position
OBJ_SEP_ANG                         POS_ANG_DIST                 Angular Distance and related quantities
OBJ_SEP_ANG                         POS_ANG_DIST_GENERAL       Angular Distance Or Separation
OBJ_SEP_ANG_RATIO                   POS_ANG_DIST_REL           Relative or Normalized Angular Distance
OBJ_SEP_ANG_DIST_SQ                 POS_ANG_DIST_SQ            Quadratic Angular Distance
OBJ_POS_ANG_VEL                     POS_ANG_VEL                  Rate Of Position Change (drift motion, angular velocity)
_POS_CCD_                           POS_CCD                        Positions Related To CCD's
_POS_CCD_X                          POS_CCD_X                    CCD Position Along the X Axis
_POS_CCD_Y                          POS_CCD_Y                    CCD Position Along the Y Axis
_POS_DET                            POS_DETECTOR                   Position Related to the Detector
_POS_DET_DIST                       POS_DETECTOR_DIST            Distance Or Position In Detector Units
_POS_R_PIX                          POS_DETECTOR_RADIUS          Radius of an Object Expressed In Detector's Unit
POS()_NX                            POS_DIR-COSINE                 Direction Cosine
POS(GEO,GEO)                        POS_EARTH                      Positions On The Earth
POS(GEO,GEO)_LAT                    POS_EARTH_LAT                Earth's Latitude
POS(GEO,GEO)_LAT                    POS_EARTH_LAT_MAIN         Earth's Latitude
OBJ(E)_LAT_VAR  ?                   POS_EARTH_LAT_VAR          Variation of Local Latitude
OBS_SITE                            POS_EARTH_LOCATION           Earth Location
POS(GEO,GEO)_LON                    POS_EARTH_LON                Earth Longitude
POS(,EC)                            POS_EC                         Ecliptic Coordinates and derivates
POS(,EC)_LAT                        POS_EC_LAT                   Ecliptic Latitude
POS(,EC)_LON                        POS_EC_LON                   Ecliptic Longitude
POS(,EQ)                            POS_EQ                         Equatorial Coordinates and related quantities
?                                   POS_EQ_A-V-PRECESS           Annual Variation of Precession in RA
POS(,EQ)_X                          POS_EQ_X                     X component of equatorial position: x=cos(Dec)cos(RA)
POS(,EQ)_Y                          POS_EQ_Y                     Y component of equatorial position: y=cos(Dec)sin(RA)
POS(,EQ)_Z                          POS_EQ_Z                     Z component of equatorial position: z=sin(Dec)
POS(,EQ)_DEC                        POS_EQ_DEC                   Declination related quantities
POS(,EQ)_DEC:3                      POS_EQ_DEC_3T              Third Term in Declination
POS(,EQ)_DEC                        POS_EQ_DEC_MAIN            Declination
POS(,EQ)_REL_DEC                    POS_EQ_DEC_OFF             Declination Offset Difference
POS_EQ_DEC_OTHER                    POS_EQ_DEC_OTHER           Declination in Non-Standard Units or partial values
POS_EQ_DEC_PRECESS                  POS_EQ_DEC_PRECESS         Precession Variation in Declination
POS(,EQ)_REL_DEC                    POS_EQ_DEC_REL             Relative Declination in a Special Scale
-                                   POS_EQ_PLX                   Relations between Parallax and RA and Dec
POS()_R_PLX_FAC                     POS_EQ_PLX_FACTOR          Parallax Factor in Declination
POS(,EQ)_PMDEC                      POS_EQ_PMDEC               Proper Motion in Declination (pmdec)
POS(,EQ)_PM                         POS_EQ_PM                  Total proper motion (can be in non-equatorial frame)
POS(,EQ)_PMPA                       POS_EQ_PM-PA               Position angle (North through East) of Proper Motion vector
POS(,EQ)_PMRA                       POS_EQ_PMRA                Proper Motion in Right Ascension (pmra)
# Proper motion is a valid concept for any sky system
POS(,EQ)_PREC                       POS_EQ_PREC                  Annual Precesion Quantities
# Precession is only relevant for systems fixed in the Earth's body
POS(,EQ)_PREC_DEC                   POS_EQ_PREC_DEC            Annual Precession In Declination
POS(,EQ)_PREC_RA                    POS_EQ_PREC_RA             Precession Variation In RA
POS(,EQ)_RA                         POS_EQ_RA                    Right Ascension related quantities
POS(,EQ)_RA:2                       POS_EQ_RA_2T               Second Component in right Ascension
POS(,EQ)_RA:3                       POS_EQ_RA_3T               Third Term In Right Ascension
POS(,EQ)_CORR_RA                    POS_EQ_RA_CORR             Correction in Right Ascension
POS(,EQ)_RA                         POS_EQ_RA_MAIN             Right Ascension
POS(,EQ)_CORR_RA                    POS_EQ_RA_OFF              RA Offset or Residual In Right Ascension
POS(,EQ)_RA_OTHER?                  POS_EQ_RA_OTHER            Right Ascension in Non-Standard Units or partial values
POS(,EQ)_CORR_RA                    POS_EQ_RA_REL              Relative Right Ascension in a Special Scale
POS(,GAL)                           POS_GAL                        Galactic Coordinates and related quantities
POS(,GAL)_COSECB                    POS_GAL_COSEC-B              Cosecant of galactic latitude
POS(,GAL)_B                         POS_GAL_LAT                  Galactic Latitude
POS(,GAL)_L                         POS_GAL_LON                  Galactic Longitude
POS(GC,GAL)_R                       POS_GAL_GC                   Galactocentric Distance
POS(HELIO,GAL)_R                    POS_GAL_HC                   Heliocentric Distance
POS(GEO,GAL)_X                      POS_GAL_X                    X coordinate of object in Galactic Plane: x=r.cos(GLAT)cos(GLON)
POS(GEO,GAL)_Y                      POS_GAL_Y                    Y coordinate of object in Galactic Plane: y=r.cos(GLAT)sin(GLON)
POS(GEO,GAL)_Z                      POS_GAL_Z                    Z coordinate of object above Galactic Plane: z=r.sin(GLAT)
POS()                               POS_GENERAL                    Position in general
POS(GEO,)                           POS_GEO                        Geocentric Quantities
?                                   POS_GEO_ANGLE                Angle Of The Geocenter
POS(GEO,EQ)_DEC                     POS_GEO_DEC                  Geocentric declination
POS(GEO,EQ)_RA                      POS_GEO_RA                   Geocentric Right Ascension
POS(TOPO,AZEL)_HA                   POS_HA                         Hour Angle
POS(HELEC,CAR)                      POS_HC                         Heliocentric Coordinates
# Heliocentric ecliptic (HELEC) or Heliocetric equatorial (HELEQ) or other?
POS(HELIO,EC)_X                     POS_HC_X                     Heliocentric X
POS(HELIO,EC)_Y                     POS_HC_Y                     Heliocentric Y
POS(HELIO,EC)_Z                     POS_HC_Z                     Heliocentric Z
POS()_INC?                          POS_INCLIN                     Inclination angles
POS(EC,?)_INC                       POS_INCLIN_EC                Inclination Respect to the ecliptic
POS(HELIO,GAL)_INC                  POS_INCLIN_GP                Inclination Respect to the Galactic Plane
POS(,LOS)_INC                       POS_INCLIN_LOS               Inclination Respect to the Line Of Sight
POS(JUPITER,PROJ)                   POS_JOVIC                      Jovicentric Coordinates (Jupiter's Phenomena)
# Presumably a coordinate system in the plane of the sky along Jupiter's pole
POS(JUPITER,PROJ)_X                 POS_JOVIC_X                  Jovicentric X
POS(JUPITER,PROJ)_Y                 POS_JOVIC_Y                  Jovicentric Y
POS(,LAMBERT)                       POS_LAMBERT                    Coordinates in the Lambert Projection
POS(,LAMBERT)_R                     POS_LAMBERT_R                Lambert Polar Distance
POS(,LAMBERT)_X                     POS_LAMBERT_X                Lambert X Coordinate
POS(,LAMBERT)_Y                     POS_LAMBERT_Y                Lambert Y Coordinate
OBS_POS_LIMIT?                      POS_LIMIT                      Position Limit to an Observation
POS_LITERAL?                        POS_LITERAL                    Literal Alpha-Delta Identification of a Position
POS_LOCATION?                       POS_LOCATION                   Location of certain events not easily expressed in other categories
?                                   POS_MAP                        Quantity Measurement on a Contour Map
?                                   POS_OCCULT                     Quantity related to the lunar occultations
MUTUAL_OCCULT(L)_DIR                POS_OCCULT_DIR               Direction of lunar motion
MUTUAL_OCCULT(L)_                   POS_OCCULT_POS               Quantity related to the lunar occultations
MUTUAL_OCCULT(L)_SLOPE              POS_OCCULT_SLOPE             Lunar Slope
#in what coords?
POS(?)_OFFSET                       POS_OFFSET                     Positional offsets, usually a string
OBS_DISP_PARANG                     POS_PAR-ANG                    Parallactic Angle
POS()_R_PX                          POS_PARLX                      Parallax and related quantities
POS()_R_PX_DYN                      POS_PARLX_DYN                Dynamical Parallax
POS()_R_PX_PHOT                     POS_PARLX_PHOT               Photometric Parallax
POS()_R_PX_RADIO                    POS_PARLX_RADIO              Radio Parallax
POS()_R_PX_SPEC                     POS_PARLX_SPEC               Spectroscopic Parallax
POS()_R_PX_TRIG                     POS_PARLX_TRIG               Trigonometric Parallax
POS(OBJ)                            POS_PLANETARY                  Coordinates in a System Related Non-Jovian Planets
POS(DET)                            POS_PLATE                      Positions measured in photographic plates
POS(DET)_DIFF                       POS_PLATE_DIFF               Difference in position or separation between objects
POS(DET)_X                          POS_PLATE_X                  X Coordinate on a Plate
POS(DET)_Y                          POS_PLATE_Y                  Y Coordinate on a Plate
POS()_PM                            POS_PM                         Proper Motion (non-equatorial) and related quantities
POS()_PM_DIFF                       POS_PM_DIFF                  Difference In Proper Motion
POS()_PM_DISP                       POS_PM_DISP                    Mean/Dispersion in proper motions (typically in clusters)
POS()_PM                            POS_PM_NON-EQ                Proper Motion (non-equatorial)
POS()_PM_PA                         POS_PM_PA                    Polar Angle of Proper Motion Vector in a non-equatorial frame
POS()_PA                            POS_POS-ANG                    Position Angle (North through East) of a certain vector
POS()_PREC?                         POS_PRECESSION                 Precession
POS(OBJ)_R                          POS_RADIUS                     Radius Used To Calculate Other Quantity
POS()_SYS                           POS_REFERENCE-SYSTEM           Used Reference System
POS(,SG)                            POS_SG                         Super Galactic Coordinates
POS(,SG)_LAT                        POS_SG_LAT                   Supergalactic Latitude
POS(,SG)_LON                        POS_SG_LON                   Supergalactic Longitude
POS(,SG)_X                          POS_SG_X                     Supergalactic X coordinate
POS(,SG)_Y                          POS_SG_Y                     Supergalactic Y coordinate
POS(,SG)_Z                          POS_SG_Z                     Supergalactic Z coordinate
POS(,SOLAR)                         POS_SOLAR                      Solar Positions
POS(,SOLAR)_ELEV?                   POS_SOLAR_ELEVAT             Solar Elevation
POS(,SOLAR)_ELONG                   POS_SOLAR_ELONG              Solar Elongation
POS_TRANS_                          POS_TRANSF                     Transformation of a Position, like WCS constants
POS_TRANS_PARAM                     POS_TRANSF_PARAM               Parameter used in astrometric transformations, e.g. WCS constants
POS(,TP)                            POS_TANG-PLANE                 Tangent Plane Position or a system attached to an object
POS(TOPO,)                          POS_TOPO                       Topocentric Positions
POS(TOPO,EQ)_DEC                    POS_TOPO_DEC                 Topocentric Declination
POS(TOPO,EQ)_RA                     POS_TOPO_RA                  Topocentric right ascension
OBJ_POS_VAR                         POS_VAR                        Positional Variations
OBJ_POS_RATE                        POS_VAR_RATE                 Rate of Variation of positional quantities
POS(TOPO,)_ZD                       POS_ZD                         Zenith Distance and related quantities
POS(TOPO,)_ZD                       POS_ZD_MAIN                  Zenith Distance
POS(TOPO,)_ZD_RESID                 POS_ZD_RES                   Residual In Zenith Distance
DATA_RECORD?                        RECORD                           Record Number
POS_R_Z                             REDSHIFT                         Redshift
POS_R_Z_DIFF                        REDSHIFT_DIFF                  Difference in redshift (usually between companions or nearby objects)
POS(GAL)_R_Z                        REDSHIFT_GC                    Galactocentric Redshift
POS(HELIO)_R_Z                      REDSHIFT_HC                    Redshift (normally heliocentric)
POS_R_Z_PHOT                        REDSHIFT_PHOT                  Photometric Redshift
DATA_PROC_REDUCT                    REDUCT                           Quantities Associated with the Reduction Process
DATA_PROC_REG_R                     REDUCT_EXTR-RAD                Extraction Radius
DATA_PROC_REDUCT_METHOD             REDUCT_METHOD                  Reduction Method
DATA_PROC_REDUCT_PARAM              REDUCT_PARAM                   Reduction Parameter
DATA_PROC_REDUCT_TECH               REDUCT_TECH                    Reduction Technique
REFER_                              REFER                            References
REFER_BIBCODE                       REFER_BIBCODE                  Reference Bibliographic Code
REFER_CODE                          REFER_CODE                     References (or reference code)
REFER_TEXT                          REFER_TEXT                     Text related to a reference, may include author, journal, editor, publisher...
REFER_JOURNAL                       REFER_JOURN                    Journal/Publication
REFER_PAG                           REFER_PAGE                     Page Number
REFER_VOL                           REFER_VOL                      Volume
_REMARKS                            REMARKS                          Remark or Comments
SPEC                                SPECT                            Spectroscopy and related quantities
SPEC_BALMER_                        SPECT_BALMER                   Properties of hydrogen balmer series
SPEC_BALMER_DEC                     SPECT_BALMER_DEC             Balmer Decrement
SPEC_BALMER_JUMP                    SPECT_BALMER_JUMP            Balmer Jump
SPEC_CONT                           SPECT_CONTINUUM                Continuum Properties
SPEC_CONT_FLUXCOR                   SPECT_CONTINUUM_CORR-FACT     Continuum Correction Factor
SPEC_CONT_DEPTH                     SPECT_CONTINUUM_DEPTH        Continuum Depth
SPEC_CONT_INDICATOR?                SPECT_CONTINUUM_INDICATOR     Continuum Indicator
SPEC_CONT_PROP?                     SPECT_CONTINUUM_PROP         Continuum Properties
SPEC_DOPPLER_PAR?                   SPECT_DOPPLER-PAR              Doppler Parameter
SPEC_EMISSIVITY()                   SPECT_EMISSIVITY               Emissivity In A Certain Waveband
SPEC_FEATURE_EW                     SPECT_EQ-WIDTH                 Equivalent Width
SPEC_FEATURE                        SPECT_FEATURE                  Spectroscopic Feature properties
SPEC_FEATURE_PROP?                  SPECT_FEATURE_PROP           Spectroscopic Feature properties
SPEC_FEATURE_EW                     SPECT_FEATURE_WIDTH          Equivalent Width of a given Feature
SPEC_FLUX()                         SPECT_FLUX                     Flux, usually in a narrow spectral band
SPEC_FLUX()_NORM                    SPECT_FLUX_NORM              Normalized Flux, usually in a narrow spectral band
SPEC_FLUX()_NORM                    SPECT_FLUX_RATIO             Spectroscopic flux ratio
SPEC_FLUX(UV)_LINE                  SPECT_FLUX_UV                Spectroscopy line flux in the uv
SPEC_FLUX()                         SPECT_FLUX_VALUE             Flux, usually in a narrow spectral band
SPEC_                               SPECT_GENERAL                  Spectroscopy in general
SPEC_HR()                           SPECT_HARDNESS-RATIO           Hardness ratio usually in X-ray
SPEC_ID?                            SPECT_ID                       Spectral identification
SPEC_INDEX()                        SPECT_INDEX                    Spectroscopic index
SPEC_BANDPASS()                     SPECT_INDEX_BANDPASS         Spectroscopic index bandpass
SPEC_INDEX(HALPHA)                  SPECT_INDEX_HALPHA           H alpha spectroscopic index
SPEC_INDEX(HBETA)                   SPECT_INDEX_HBETA            H Beta spectroscopic index
SPEC_INDEX(HGAMMA)                  SPECT_INDEX_HGAMMA           H gamma spectroscopic index
SPEC_INDEX()                        SPECT_INDEX_MISC             Miscellaneous spectroscopic index
SPEC_FLUX_INT                       SPECT_INTEGRAL                 Integral spectrum
SPEC_INTENSITY()                    SPECT_INTENSITY                Spectral Intensity
SPEC_INTENSITY()                    SPECT_INTENSITY_ESTIMATED     Estimated Intensity
SPEC_INTENSITY()_DROP               SPECT_INTENSITY_FR-DROP      Intensity Drop Fraction
SPEC_INTENSITY(HBETA)_NORM          SPECT_INTENSITY_HBETA-NORM     Hbeta Normalized Intensity
SPEC_INTENSITY()_COUNT              SPECT_INTENSITY_INST-UNIT     Intensity In Instrumental Units
SPEC_INTENSITY()                    SPECT_INTENSITY_MAIN         Spectral Intensity
SPEC_INTENSITY()_NORM               SPECT_INTENSITY_RATIO        Intensity Ratio
SPEC_INTENSITY()_NORM               SPECT_INTENSITY_REL          Relative Intensity
SPEC_LINE_                          SPECT_LINE                     Spectral Line Properties
SPEC_LINE_WIDTH_BROAD?              SPECT_LINE_BROADENING        Line Broadening
SPEC_LINE_LAMBDA                    SPECT_LINE_CENT              Line Central Position
SPEC_LINE_DEPTH?                    SPECT_LINE_DEPTH             Line Depth
SPEC_LINE_DEPTH_DIFF                SPECT_LINE_DEPTH_DIFF      Difference In Line Depth
SPEC_LINE_DEPTH?                    SPECT_LINE_DEPTH_VALUE     Line Depth
SPEC_LINE_ENERGY                    SPECT_LINE_ENERGY            Line Energy
SPEC_LINE_FREQ                      SPECT_LINE_FREQUENCY         Line Frequency (usually in radio)
SPEC_LINE_FREQ_DIFF                 SPECT_LINE_DIFF-FREQ         Differential frequency between two lines (usually in radio)
SPEC_LINE_WIDTH_FWHM                SPECT_LINE_FWHM              Line Full Width Half Maximum (FWHM)
SPEC_LINE_ID                        SPECT_LINE_ID                Line Identification
SPEC_LINE_INTENSITY                 SPECT_LINE_INTENSITY         Line Intensity
SPEC_LINE_MOMENT                    SPECT_LINE_MOMENT            Line Moment
SPEC_LINE_INTENSITY_RATIO           SPECT_LINE_RATIO             Line Ratio
SPEC_LINE_STRENGTH                  SPECT_LINE_STRENGTH          Line Strength
SPEC_LINE_TEMP                      SPECT_LINE_TEMP              Line temperature
SPEC_LINE_WIDTH                     SPECT_LINE_WIDTH             Line Width
OBJ_CLASS_LUM                       SPECT_LUM-CLASS                Luminosity Classification
SPEC_LUM()_DLAMBDA                  SPECT_LUM/WVLNGTH-INT          Luminosity per Wavelength Interval
SRC_LUM()                           SPECT_LUMINOSITY               Monochromatic Luminosity
SPEC_INTENSITY()_NORM               SPECT_NORMALIZED               Normalized Spectrum
OBJ_CLASS_SPEC_PEC                  SPECT_PECUL                    Spectral Peculiarities
SPEC_POWER?                         SPECT_POWER                    Spectral Power
OBS_COV_BAND_RANGE                  SPECT_RANGE                    Spectral Range
OBS_COV_BAND_RES                    SPECT_RESOLUTION               Spectral Resolution
OBS_SN                              SPECT_S/N                      Spectrum Signal To Noise Ratio
OBS_EXP_BAND                        SPECT_SENSITIVITY              Spectral sensitivity
SPEC_INDEX_HR_SOFTNESS              SPECT_SOFTNESS-RATIO           Softness ratio usual in x ray
SPEC_INDEX_POS                      SPECT_SP+INDEX                 Spectral Index (positive alpha)
SPEC_INDEX_NEG                      SPECT_SP-INDEX                 Spectral Index (negative alpha)
SPEC_STARK?                         SPECT_STARK                    Stark effect related quantities
SPEC_SUN?                           SPECT_SUN                      Solar Spectrum
OBJ_CLASS_SPEC                      SPECT_TYPE                     Spectrum Classification
OBJ_CLASS_SPEC                      SPECT_TYPE_GENERAL           Spectrum Classification
OBJ_CLASS_SPEC_MK                   SPECT_TYPE_MK                MK Spectral Classification
OBJ_CLASS_SPEC_RADIO                SPECT_TYPE_RADIO             Radio Spectral Type
SPEC_LINE_VEL                       SPECT_VELOC                    Velocity (associated with lines)
SPEC_LINE_VEL                       SPECT_VELOC_VALUE            Velocity (associated with lines)
SPEC_LINE_WIDTH_VEL                 SPECT_VELOC_WIDTH            Velocity width
SPEC_LINE_LAMBDA                    SPECT_WAVELENGTH               Wavelength (associated to lines)
SPEC_LINE_LAMBDA                    SPECT_WAVELENGTH_CENTRAL     Central wavelength
SPEC_LINE_LAMBDA_DIFF               SPECT_WAVELENGTH_DIFF        Difference in Wavelength
SPEC_LINE_LAMBDA?                   SPECT_WAVELENGTH_MISC        Wavelength (associated to lines)
_STAT_                              STAT                             Statistical Properties
_STAT_REJPC                         STAT_%REJECT                   Percent of Rejection
SAMPLE_STAT_COMPLETENESS            STAT_COMPLETENESS              Degree of Completeness of a Sample
# Concepts: Population, sample
SAMPLE_STAT_CORR                    STAT_CORRELATION               Correlation
SAMPLE_STAT_COVAR                   STAT_COVAR                     Statistical covariance parameter
_STAT_LIKELIHOOD                    STAT_LIKELIHOOD                Maximum Likelihood of existence or occurence
_STAT_LIKERATIO                     STAT_LIKELIHOOD-RATIO          Likelihood Ratio
_STAT_MEAN                          STAT_MEAN                      Statistics Mean Value
_STAT_MEDIAN                        STAT_MEDIAN                    Statistics Median Value
_STAT_DF                            STAT_N-DOF                     Degrees of Freedom
_STAT_PARAM?                        STAT_PARAM                     Statistic Parameter or Factor
_STAT_PROB                          STAT_PROBABILITY               Probability
?                                   STAT_PROP                      Statistical Properties
_STAT_SAMPFAC                       STAT_SAMP-FACTOR               Sampling Factor
_STAT_SIGNIF                        STAT_SIGNIFICANCE              Statistical Significance
_STAT_SD                            STAT_STDEV                     Statistical standard deviation (square root of the variance)
_STAT_VAR                           STAT_VAR                       Statistical variance (squared standard deviation) or second moment
OBS_TEL                             TEL                              Telescopes
OBS_TEL_APERTURE                    TEL_APERTURE                   Telescope Aperture
OBS_TEL_FOCLEN                      TEL_FOCAL-LENGTH               Focal Length
OBS_TEL_ID                          TEL_ID                         Telescope Identification
TIME                                TIME                             Time and related Quantities
OBJ_AGE                             TIME_AGE                       Age
OBJ_TCROSSING                       TIME_CROSSING                  Crossing Time
OBJ_CYCLE                           TIME_CYCLE                     Cycle number of a variable object.
TIME_DATE                           TIME_DATE                      Date (Julian Date or Heliocentric Julian date)
OBJ_TDELAY                          TIME_DELAY                     Time Delay
TIME_DIFF                           TIME_DIFF                      Time Difference O-C Residual
OBJ_DPDT                            TIME_DP/DT                     Period Rate Of Change
TIME_EPOCH                          TIME_EPOCH                     Epoch
TIME_EQUINOX                        TIME_EQUINOX                   Equinox
TIME_EVOL?                          TIME_EVOLUTION                 Evolution Time
OBS_EXPTIME                         TIME_EXPTIME                   Exposure Time
OBS_TIME_INTVL?                     TIME_INTERVAL                  Time Interval
?                                   TIME_LIMIT                     Time Limit
TIME                                TIME_MISC                      Time in general
OBJ_ORB_PERIOD                      TIME_PERIOD                    Period
OBJ_ORB_PHASE                       TIME_PHASE                     Phase (in the context of periodic variable objects)
TIME_RATE                           TIME_RATE                      Rate Of Certain Phenomenon
TIME_RELAX                          TIME_RELAXATION                Relaxation Time
OBS_COV_TIME_RES                    TIME_RESOLUTION                Time resolution
TIME_SCALE                          TIME_SCALE                     Time Scale
TIME_ZONE                           TIME_ZONE                      Time Zone
_UNIT                               UNITS                            Units in which a quantity is measured
.                                   VAR                              Quantities related to variable objects
PHOT_VAR_AMPL                       VAR_AMPLITUDE                  Amplitude of variation and related quantities
PHOT_VAR_AMPL_RATIO                 VAR_AMPLITUDE_RATIO          Amplitude Ratio
PHOT_VAL_AMPL                       VAR_AMPLITUDE_VALUE          Amplitude of variation
OBJ_CLASS_VAR                       VAR_CLASS                      Type of variability
OBJ_ROT_DFDT2_BARY                  VAR_DF/DT2                     2nd time derivative of barycentric rotation frequency in seconds
OBJ_ROT_DFDT3_BARY                  VAR_DF/DT3                     3rd time derivative of barycentric rotation frequency in seconds
OBJ_EPH_ECLIPSE_CYCLE               VAR_ECL-CYC-N                  Eclipse Cycle Number
PHOT_VAR_FRAC?                      VAR_FRACT-LIGHT                Fraction Light
PHOT_VAR_INDEX                      VAR_INDEX                      Variability Index
PHOT_VAR_DROP                       VAR_LIGHT-DROP                 Light Drop
PHOT_MAG()_VAR_RANGE                VAR_MAG-RANGE                  Magnitude Range
?                                   VAR_MEAN                       Quantity at stage of mean
?                                   VAR_MODEL-FIT                  Variability Fit Parameter
PHOT_VAR_PERIOD                     VAR_PERIOD                     Period of Variability and related quantities
PHOT_VAR_PERIOD                     VAR_PERIOD_VAR               Period Variations
PHOT_VAR_PRIMIN                     VAR_PRIM-MIN                   Primary Minimum Importance
PHOT_VAR_PROB                       VAR_PROBABILITY                Probability of Variability
PHOT_VAR_PULSE                      VAR_PULSE                      Quantities related to pulses (pulsars)
PHOT_VAR_PULSE_EW                   VAR_PULSE_EQ-WIDTH           Pulse Equivalent Width
PHOT_VAR_PULSE_WIDTH                VAR_PULSE_WIDTH              Pulse Width
PHOT_VAR_RADIAL                     VAR_RAD-OSCILL                 Radial Oscillation Parameter
PHOT_VAR_FREQ                       VAR_RRLYRA-FREQ                Frequency Of RR Lyrae
# Why specifically RR Lyr?
PHOT_VAR_SECMIN                     VAR_SEC-MIN                    Secondary Minimum Importance
OBJ_VEL                             VELOC                            Velocity
OBJ_VEL_BARY                        VELOC_BARYCENTER               Barycenter Velocity
OBJ_VEL_CM                          VELOC_CM                       Velocity Refered to a Co-Moving System
OBJ_VEL_CM_X                        VELOC_CM_X                   Comoving Velocity Along X Eastward
OBJ_VEL_CM_Y                        VELOC_CM_Y                   Comoving Velocity Along Y Northward
OBJ_VEL_CM_Z                        VELOC_CM_Z                   Comoving Velocity Along the Line of Sight
OBJ_VEL(CMB)_R                      VELOC_CMB                      Radial Velocity respect to the 3K CMB
OBJ_VEL_CORR                        VELOC_CORR                     Velocity Correction
OBJ_VEL_DIFF                        VELOC_DIFF                     Velocity Difference
OBJ_VEL_DISP                        VELOC_DISP                     Velocity Dispersion
OBJ_VEL_ESCAPE                      VELOC_ESCAPE                   Escape Velocity
OBJ_VEL_EXPANSION                   VELOC_EXPANSION                Expansion Velocity
OBJ_VEL(GAL)                        VELOC_GAL                      Space Velocity In Galactic Coordinates
OBJ_VEL(GAL)_PHI                    VELOC_GAL_PHI                Space Velocity In Galactic Coordinate Phi Component
OBJ_VEL(GAL)_RHO                    VELOC_GAL_RHO                Space Velocity In Galactic Coordinate Rho Component
OBJ_VEL(GAL)_U                      VELOC_GAL_U                  Space Velocity In Galactic Coordinate U Component
OBJ_VEL(GAL)_V                      VELOC_GAL_V                  Space Velocity In Galactic Coordinate V Component
OBJ_VEL(GAL)_W                      VELOC_GAL_W                  Space Velocity In Galactic Coordinate W Component
OBJ_VEL(GAL)_R                      VELOC_GC                       Galactocentric Radial Velocity
OBJ_VEL(GEOC)_R                     VELOC_GEOC                     Geocentric Radial Velocity
OBJ_VEL(HELIO)_R                    VELOC_HC                       Heliocentric Radial Velocity
OBJ_VEL(LG)_R                       VELOC_LG                       Local Group Radial Velocity
OBJ_VEL(LSR)_R                      VELOC_LSR                      Radial Velocity Respect to the Local Standard of Rest
OBJ_VEL_MAX                         VELOC_MAX                      Maximum or Terminal Velocity
OBJ_VEL_MEAN                        VELOC_MEAN                     Mean Velocity
MED_MATTER_VEL_MICROTURB            VELOC_MICRO-TURB               Microturbulence Velocity
OBJ_VEL                             VELOC_MISC                     Velocity in general
OBJ_VEL(OBS)                        VELOC_OBS                      Observed velocity (without corrections)
OBJ_VEL_OCCULT                      VELOC_OCCULT                   Occultation Velocity
OBJ_VEL_ORB                         VELOC_ORBIT                    Orbital Velocity
OBJ_VEL_PEC                         VELOC_PECULIAR                 Peculiar Velocity
OBJ_VEL_PREENTRY                    VELOC_PRE-ENTRY                Pre-Entry Velocity (meteorites)
OBJ_VEL_PULSAT                      VELOC_PULSAT                   Pulsation Velocity
OBJ_VEL_RANGE                       VELOC_RANGE                    Velocity Range
OBJ_VREL                            VELOC_RELAT                    Relative Velocity
OBJ_VEL_RESID                       VELOC_RESID                    Residual velocity (any component or system)
OBJ_VEL_RMS                         VELOC_RMS                      Velocity RMS
OBJ_VROT                            VELOC_ROTAT                    Rotational Velocity
OBJ_VEL                             VELOC_SPACE                    Space Velocity
OBJ_VEL_X                           VELOC_SPACE_X                Space Velocity X Component
OBJ_VEL_Y                           VELOC_SPACE_Y                Space Velocity Y Component
OBJ_VEL_Z                           VELOC_SPACE_Z                Space Velocity Z Component
OBJ_VEL_R_SYSTEMIC                  VELOC_SYST                     Systemic Velocity
OBJ_VEL(HELIO)_R                    VELOC_SYST_HC                Heliocentric Systemic Velocity
OBJ_VEL_R_SYSTEMIC                  VELOC_SYST_MISC              Systemic Velocity
OBJ_VEL_TANG                        VELOC_TANG                     Tangential Velocities
OBJ_VEL_TANG_GAL                    VELOC_TANG_GAL               Tangential Velocity in Galactic Frame
OBJ_VEL_TANG                        VELOC_TANG_MISC              Tangential Velocity
OBJ_VEL_TANG_PEC                    VELOC_TANG_PEC               Peculiar Tangential Velocity
OBJ_VEL_TOT                         VELOC_TOTAL                    Total Velocity
OBJ_WIND_VEL                        VELOC_WIND                     Wind Velocity
_WEIGHT                             WEIGHT                           Statistical Weight Associated to Data Fits
PHOT_BAND_ID                      -                               Band ID
PHOT_COL(*PHOT_SYS,*PHOT_COL_ID)  PHOT_INDX                      Photometric index (usually in narrow bands)
PHOT_FLUX(*PHOT_BAND_ID)              - 
PHOT_MAG(*PHOT_SYS_ID,*PHOT_BAND_ID) -



Appendix 2:

In X-ray land, Dean Hinshaw and I made a start on a list of objects we use.
I've tried to group related concepts as much as possible.

*** Types of data object:

UCD/PCD          Dataset Name

DATA_EVTLIST     EVENT LISTS
DATA_IMAGE2D     DATA HISTOGRAMS: (spatial) 2D-IMAGES (with nulls)
DATA_HIST_ENERGY DATA HISTOGRAMS: (energy) SPECTRA
DATA_HIST_TIME   DATA HISTOGRAMS: (temporal) LIGHT CURVES
OBS_DATA         OBSERVATION PARAMETERS
                 COORDINATES (Spatial, Temporal, Gain, Dispersion-relation, General)
OBS_COV_TIME     COVERAGE - Temporal (GTIs, TSTART family)
OBS_COV_POS      COVERAGE - Spatial (Regions, RA_NOM family, Source/Background pairs)
OBS_COV_INST_POS COVERAGE:  Spatial (instrumental)  = BAD PIXEL MAPS
OBS_COV          COVERAGE - general filters, Data Subspace
SAMPLE_CAT       SOURCE LISTS (see regions)
INST_GEOM        INSTRUMENT/TELESCOPE GEOMETRY; BORESIGHT
OBS_SITE_ORBIT   ORBIT EPHEMERIS
OBS_ASOL         ASPECT SOLUTION
OBS_EXP_POS      EXPOSURE MAPS  (units of [s], units of [erg cm^-2 s^-1/count s^-1])
OBS_EXP_ENERGY   SENSITIVITY MAP: vs Energy (ARF, Filter transmission)
OBS_EXP_TIME     SENSITIVITY MAP: vs Time (dead time correction, XMM EXPOSUn)
OBS_EXP_POS_INST SENSITIVITY MAP: vs Position (QE map, VIGNETTING)
OBS_EXP_POS_VIG  
OBS_EXP_POS_BIAS BIAS MAPS
OBS_RESP_POS    KERNELS (spatial): PSF;  GRADE/PATTERN
OBS_RESP_ENERGY KERNELS (energy): RMFs, LSFs
OBS_RESP_TIME   KERNELS (temporal): TIMEDEL
OBS_RESP_ENERGY_GAIN      GAIN MAPS (gain is a simplified RMF)
OBS_RESP_ENERGY_GAIN_TIME GAIN CAL (versus time)
OBS_HK_TIME      HOUSEKEEPING: Mission Timeline, engineering data
        [includes: Commanded sc/instrument parameters; 
                   measured sc/instrument parameters;
                   measured environmental information
                   calculated (e.g. sun angle) environmental info]


Keywords in EVENT lists (in progress) ----


UCD/PCD                           FITS 

DATA_IMAGE_DIM                    NAXIS                Image dimension
DATA_ITEM_TYPE                    TFORM                Data item datatype
DATA_ITEM_NAME                    TTYPE                Data item name
OBS_DATE                          DATE-OBS             Start Observation date as string
OBS_DATE:2                        TIME-OBS   (ROSAT, now obsolete)
OBS_DATE_END                      DATE-END             End of obs date as string
OBS_DATE_END:2                    TIME-END   (Rosat, now obsolete)
DATA_PROV_ORIGIN                  ORIGIN               
DATA_PROV_CREATOR                 CREATOR
OBS_COV_TIME_FRAME               TIMESYS
OBS_COV_TIME_ORIGIN_MJD          MJDREF
OBS_COV_TIME_ORIGIN_MJD:1        MJDREFI  (Rosat)
OBS_COV_TIME_ORIGIN_MJD:2        MJDREFF  (Rosat)
OBS_COV_TIME_INST_DIFF           TIMEZERO		Clock corr
OBS_COV_TIME_INST_UNIT           TIMEUNIT
OBS_COV_TIME_INST_START          TSTART
OBS_COV_TIME_INST_STOP           TSTOP
OBS_COV_TIME_START_MJD           MJD-OBS  (Rosat)
OBS_MISSION                       MISSION
OBS_TEL                           TELESCOP
OBS_INST_ID                       INSTRUME
OBS_ID                            OBS_ID
OBS_ID2                           SEQ_NUM
DATA_PROC_SYS_VER                 ASCDSVER, PROC_SYS
DATA_PROC_VER                     REVISION
DATA_CONTENT_CLASS_ORG            HDUCLASS
DATA_CONTENT_CLASS1               HDUCLAS1
DATA_CONTENT_CLASS2               HDUCLAS2
DATA_CONTENT_CLASS3               HDUCLAS3
DATA_FILE_DATE                    DATE
OBS_COV_TIME_ERR_ABS             TIERABSO
OBS_COV_TIME_ERR_REL             TIERRELA
OBS_COV_TIME_BIN_TYPE            TIMEPIXR           Begin middle or end of bin
OBS_COV_TIME_RES                 TIMEDEL
OBS_DET_ID                       DETNAM
OBS_DISP_ID                      GRATING
OBS_TARGET_ID                    OBJECT
OBS_TITLE                        TITLE
OBS_AUTHOR_CODE                  OBSERVER
OBS_DET_POS_ORIGIN_X             SIM_X              Offset of detector origin from opt axis
OBS_DET_POS_ORIGIN_Y             SIM_Y              Offset of detector origin from opt axis
OBS_DET_POS_ORIGIN_Z             SIM_Z              Offset of detector origin from opt axis
OBS_DET_DEFOCUS                  DEFOCUS  mm
OBS_TEL_FOCLEN                   FOC_LEN
OBS_TEL_MODE                     OBS_MODE
OBS_DET_MODE                     DATAMODE
OBS_DET_READ_MODE                READMODE
OBS_DET_READ_CYCLE               CYCLE         For obs split into different configs
OBS_POS(,EQ)_RA                  RA_NOM 
OBS_POS(,EQ)_DEC                 DEC_NOM
OBS_DET_ROLL                     ROLL_NOM      Nominal rotation of detector
OBJ_POS(,EQ)_RA                  RA_TARG
OBJ_POS(,EQ)_DEC                 DEC_TARG
TIME_EQUINOX                     EQUINOX                   Equinox
POS_FRAME                        RADECSYS
DATA_CLASS                       DATACLAS
OBS_EXPTIME                      ONTIME
OBS_EXPTIME_CORRECTED            LIVETIME
OBS_EXPTIME_CORRECTED            EXPOSURE
OBS_EXPTIME_CORRECTION           DTCORR
OBS_ASOL_TYPE                    ASPTYPE
DATA_HISTORY                     HISTORY
OBS_COV_TIME_INST_RAW_START:2    START_MNF
OBS_COV_TIME_INST_RAW_START:1    START_MJF
OBS_COV_TIME_INST_RAW_STOP:1     STOP_MJF
OBS_COV_TIME_INST_RAW_STOP:2     STOP_MNF
EVENT_TIME_INST                  TIME
OBS_INST_DET_ID                  CCD_ID
OBS_INST_DET_CCD_NODE            NODE_ID
OBS_EXPOSURE_NO                  EXP_NO
EVENT_POS(INST,CHIP)_X           CHIPX
EVENT_POS(INST,CHIP)_Y           CHIPY
EVENT_POS(INST,DET)_X            DETX
EVENT_POS(INST,DET)_Y            DETY
EVENT_POS(INST,TDET)_X           TDETX
EVENT_POS(INST,TDET)_Y           TDETY
EVENT_POS(INST,SKY)_X            X
EVENT_POS(INST,SKY)_Y            Y
EVENT_ENERGY_INST_PIX            PHAS    # per pixel
EVENT_ENERGY_INST                PHA
EVENT_ENERGY                     ENERGY
EVENT_ENERGY_INST_CORR           PI
EVENT_PATTERN_FLT                FLTGRADE
EVENT_PATTERN_ASCA               GRADE
EVENT_QUALITY_MASK               STATUS
DATA_CAL_FILE_ENERGY_SCALE       GAINFILE
DATA_CAL_FILE_PATTERN            GRDFILE
DATA_CAL_FILE_BADPIX             BPIXFILE
DATA_CAL_FILE_BIAS_DET(*ID)      BIASFILid
DATA_TLM_VERSION                 FSW_VERS
OBS_COV_TIME_INST_DET(*ID)_           GTIid
OBS_COV_TIME_INST_DET(*ID)_START      GTIid:START
OBS_COV_TIME_INST_DET(*ID)_STOP       GTIid:STOP
OBS_COV_PATTERN                  DSVAL(GRADE)
OBS_COV_TIME_CLOCKAPP_Q          CLOCKAPP
OBS_POS(,EQ)_COORD_RA            TCTYPn = RA---TAN
OBS_POS(,EQ)_COORD_DEC           TCTYPn = DEC--TAN
OBS_POS(,EQ)_COORD_SCALE         TCDLTn
OBS_POS(,EQ)_COORD_REF           TCRVLn
OBS_POS(,EQ)_COORD_PIX           TCRPXn
OBS_POS(,DET)_COORD_THETA        TCTYPn =, TCNAM=THETA
OBS_POS(,DET)_COORD_PHI          TCTYPn =, TCNAM=PHI
OBS_POS(,DET)_COORD_SCALE etc

ROSAT file:

DATA_FORMAT_DATE                  RDF_DATE  (Rosat)
DATA_FORMAT_VER                   RDF_VERS
OBS_FILTER                        FILTER
OBS_ID2                           ROR_NUM
OBS_DET_MODE                      SETUPID
OBS_ID_SUBID                      OBI_NUM
OBS_COV_TIME_INST_START           SCSEQBEG 
OBS_COV_TIME_INST_STOP            SCSEQEND
OBS_ID_NSUBID                     NUM_OBIS
OBS_COV_TIME_CLOCKAPP_S           CLOCKCOR
DATA_EVENT_REJ_                   EXTNAME = REJEVT



From dide at discovery.saclay.cea.fr  Thu Mar 27 02:36:30 2003
From: dide at discovery.saclay.cea.fr (DIDELON Pierre)
Date: Thu, 27 Mar 2003 11:36:30 +0100 (MET)
Subject: UCDs status and perspectives
Message-ID: <200303271036.h2RAaUd29807@rosetta.saclay.cea.fr>

----------
X-Sun-Data-Type: text
X-Sun-Data-Description: text
X-Sun-Data-Name: text
X-Sun-Charset: us-ascii
X-Sun-Content-Lines: 25

Hi Anita, Ray et al,

I globally and fully agree with all your points and comments,
the most important one is to use the only available quite exhaustive
metadata (UCD) as a crucial use case to elaborate a more flexible
and sophisticated schema.
I am impressed by Ray's willingness to define a metadata model
to refactored the domain, and I am waiting it with great eagerness.
I was thinking about such a process and the most difficult part 
for me is the mechanism to keep a link to UCD and continuing to
support them.
I tried to formalize the possible inter-relations in the attached
UML diag, (triangle at the beginning of a line is inheritance,
others lines are relations; assoc,agreg....).
Several question araise already in my mind even at this very simple level :
- Does Descriptor and Group... need to inheritate from Atom and Descriptor,
or is the association use/is_part_of sufficient? In other words, do we
need several level of composition? Group of group of Descriptors?...
- is the relation UCD/PAD formally needed?
- Which is the link between the actual UCD_Tree and all the possible
and usefull descriptors associations?

cheers,
pierre

----------
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From jcm at head-cfa.cfa.harvard.edu  Sun Mar 30 16:29:05 2003
From: jcm at head-cfa.cfa.harvard.edu (jcm at head-cfa.cfa.harvard.edu)
Date: Sun, 30 Mar 2003 19:29:05 -0500 (EST)
Subject: UCD Status and Perspectives
Message-ID: <200303310029.h2V0T5M29580@urania.cfa.harvard.edu>


Patricio,
 I realize I never followed up your message of Mar 19. For the record,
what I had in mind with my spectral index example, I had in
mind finding the sources in a subsample and calculating what their
4100A fluxes are, for instance to get a sample for an observing proposal
of the 10 brighest northern objects of a particular class, brightest by
4100A flux. And I want to do it even including objects whose 4100A flux
is not actually known, but can be guessed from other published fluxes assuming
an SED.        
 In general, the existing UCDs are great for getting general information but
not for knowing exactly what you have, that was the broader point. A side point
from this example is that I think the VO will need to allow users to specify
certain assumptions to provide a context for queries (I'm looking for quasars,
and here's what you can assume about quasars - e.g. a typical SED - so that you
can handle my query even in cases where the information is incomplete... a bit
like a Bayesian prior in spirit, I guess).


  Regards, Jonathan