Program sfspectra | Frequency spectra. 
[SYNOPSIS]
sfspectra < in.rsf > out.rsf all=n opt=y
[COMMENTS]

March 2012 program of the month:
http://ahay.org/blog/2012/03/18/program-of-the-month-sfspectra/

[PARAMETERS]
bool    | all | =n |  [y/n] | 	if y, compute average spectrum for all traces 
bool    | opt | =y |  [y/n] | 	if y, determine optimal size for efficiency 
[DIRECTORY]
system/generic
