Level 2 Help for FFTFLIP

Input fft(s) produced by fft2, fft22, or Rfft2 in halfword or byte format.

Rearranged output fft(s).

Dimension of fft in pixels; each fft must be square.

Default is NLW is the smaller of NL and NS.

'FLIP causes the program, after rearranging each fft, to perform a 
transposition along the upper-left to lower-right diagonal.

LINE specifies the number of lines above and below DC that are to be averaged
together as a form of pseudo apodizing.  

The default is 0, i.e. no averaging is performed.

DC specifies the number of lines surrounding DC that are to be excluded from
the 'LINEs' averaging.  This is ignored if LINE=0.

The default is 1, that is, only the DC line is excluded.