[daip] FITLD and rejected records {External}

[egreisen]

On 2023-06-09 15:33, Arnaud Collioud via Daip wrote:
> Dear Amy and Eric,

FITLD will reject data with weight 0 automatically and that seems to be
what it has done in your case.  The weight threshold is tested and
applied only if > 0, but weight 0 data are discarded even when weight
threshold is 0.  If FITLD did not do this, you would have data in the
file that you never could access.  Note that the visibilities must be
divided by the weight to have a proper scale and divide by 0 is not
a good thing to do.

Eric Greisen

> 
> I am currently processing an EVN VLBI session at K-band, correlated at
> JIVE. As usual, I am using FITLD to load the data (well, I took here
> the first data file of the session as an example) into my up-to-date
> AIPS (31DEC23).
> 
> FITLD tells me that:
> 
>  Current file has   157133 visibilities
> 
> and starts loading the data.
> 
> When done, I am getting the message :
> 
> Rejected  62177 records based on weights
>    94956 vis. written
> 
> Could you please explain to me what is happening here (WTTHRESH is set
> to 0)?
> 
> (I attached the full FITLD log)
> 
> Thanks in advance!
> 
> Arnaud
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