[daip] CLCOR 'OPAC' & VLBA correlator question

[Eric Greisen]

Michael Bietenholz wrote:
>    For a VLBI data set, the VLBA correlator has an atmosphere model
> which it used for delays etc., but does it apply any sort of opacity
> correction?  In particular, is running CLCOR, OPCO = 'OPAC' a good
> thing to do for VLBA stuff, or would it apply the opacity correction
> twice, and therefore be bad?  (I'm aware of the fact that this opacity
> correction only very approximate, but its better than nothing).
> 
FITLD does not apply any correction (CL table 1 amplitudes are all 1.0).
I don't think there is anything done before FITLD.  The model is really 
for phases.

Eric Greisen