[daip] frequency axis reversal

[Aaron Cohen]

Dear Designated AIPS,

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?

Thanks,
Aaron Cohen