[daip] AIPS help

[Eric Greisen]

Rane, Akshaya A wrote:
> Inconsistencies between UVPLT and TVFLG?
> 
> Here's a question:
> 
>     I am re-reducing 1667 MHz OH spectral line data from project AC319 (JUN-92, polarizations RR, LL, RL, LR). I chose one spectral channel from one day, and I plotted the visibility amplitudes with both TVFLG and UVPLT. The data are split, and they are for the program source W22.
> 
>     I plotted the visibility amplitudes in UVPLT (stokes 'rr'), and I don't see any amplitudes over 20 Jy for baseline lengths 4 - 9 kilolambda. However, when I plot the same data in TVFLG (stokes 'rr', sorted by length), I see a number of amplitudes higher than 20 Jy in the same baseline range.
> 
>     Why would the higher amplitudes be displayed by TVFLG but not by UVPLT? In both cases, I chose flagver =-1, so no flagging should have been applied when I ran either task.

Good question - did you specify Stokes 'rr' and uvrange=4,9 to TVFLG 
also?  Were all other adverbs the same?  You might also try UVPRT.  Note 
that all 3 use the same low level subroutines so we have to look for 
inconsistancies in the adverbs.

Eric Greisen