[daip] frequency axis reversal

[Eric Greisen]

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