[daip] [evlatests] frequency axis reversal

[Barry Clark]

The sign of the phase is also reversed, so the maps will be mirror images.

> From evlatests-bounces at donar.cv.nrao.edu  Thu Sep 13 14:10:28 2007
> 
> Aaron Cohen writes:
> 
>  > I am working on a multichannel data set that apparently has it's
>  > frequency axis reversed due to a correlator error.  Thus channel 1 is
>  > labeled as the lowest frequency even though it appears that it is really
>  > the highest frequency.  I have tried using puthead to insert a negative
>  > frequency increment, but this doesn't seem to change anything.  Is there
>  > any way I can undo this within AIPS?
> 
> If that is the only problem - and we do not know what is going on at
> present - then the most important place to change is the FQ table.
> the header might also be used at times so change both.
> 
> Eric Greisen
> 
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