[daip] FITLD problem

[Eric Greisen]

Thomas Krichbaum wrote:
> thanks for the quick reply. The reason why I was asking is related to problems
> fitld'ing 3mm vlbi data. After FITLD some baselines apparently are missing (eg. PT-LA is ok, Yebes-LA is ok,
> but for PT-Yebes 50% of the scans are missing). Furthemore after DTSUM I see only 6 secs of
> data, rather than the expected 440 sec. I now need to wait until Walter and Helge find the time to
> debug this. This is really puzzling and I can;t judge if this  is a problem of AIPS or difx2fits.
> 
> regards,
>             Thomas
> 
> On Tuesday 08 May 2012, Walter Brisken wrote:
>> Hi Thomas,
>>
>> These are just notes more than warnings.  There are two additional columns 
>> in the source table now descibing the pointing positions of the antennas 
>> during the observation.  In your case these were not populated so the 
>> phase/delay center was used instead.  Nothing to worry about.
>>
>> -W
>>
>> On Tue, 8 May 2012, Thomas Krichbaum wrote:
>>
>>> Hi,
>>>
>>> after reading in a file created by latest version of difx2fits, I get the following error message
>>> after FITLD (in version TST):
>>>
>>> vlb073> FITLD1: Task FITLD  (release of 31DEC12) begins
>>> vlb073> FITLD1: Data with weight <  0.50 will be permanently flagged
>>> vlb073> FITLD1: Create C112A       .UVDATA.   1 (UV)  on disk  9  cno    1
>>> vlb073> FITLD1: SOINI: 'RAOBS' COLUMN NOT FOUND
>>> vlb073> FITLD1: SOINI: 'DECOBS' COLUMN NOT FOUND
>>>
>>> What does it mean and can I ignore it ?

As Walter remarked, this is due to a change that allows for future plans 
but which handles your case correctly despite the warning messages.

As for the missing data, try running FITLD with WTTHRESH set to zero. 
Then examine the presence of data with PRTUV which will show data of 0 
weight in case it is the data weight that is the issue...

ERic Greisen