[daip] What does CAL mean in VLBA archive data?

[Simon Ellingsen]

Hi,
	Sorry if this is a stupid question, but I've downloaded one of my old  
projects from the VLBA archive (I still have the original DAT tapes  
with the raw data on them, but no easy access to a DAT drive anymore  
to load the data directly from the tape) and am having some problems  
with the basic processing.

The project in question is BE0014 observed in May 1997 and the archive  
lists the type of the observation as "cal" rather than "raw", so I  
assume that some sort of basic calibration pipeline has been run on  
data?  Is there a description somewhere as to what processing has been  
done, I've had a look around the archive pages and done some googling,  
but not turned anything up yet?

The crux of the problem is straight forward - Running CVEL on the data  
(the project was some observations of 12.2 GHz methanol masers) seems  
to blur the emission.  The strong maser emission ends up being reduced  
in amplitude compared to the raw data and sitting on a broad hump of  
weaker emission which isn't present in the raw data.  It looks as if  
the velocity corrections have already been applied either prior to or  
during loading.  I've carefully checked the parameters in FITLD, SETJY  
and CVEL (and tried lots of different combinations) and can't see  
where the problem is coming from.  Any suggestions would be much  
appreciated.

Regards

Simon
--
Simon Ellingsen : Senior Lecturer Physics & Astronomy, University of  
Tasmania
email : Simon.Ellingsen at utas.edu.au
WWW   : http://www-ra.phys.utas.edu.au/~sellings
Phone : 6226 7588 ;                       Area Code : +61 3  
(International)
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