Program sfhelicon | Multidimensional convolution and deconvolution by helix transform. 
[SYNOPSIS]
sfhelicon < in.rsf filt=filt.rsf > out.rsf n= adj=n div=n lag=
[COMMENTS]

May 2014 program of the month:
http://ahay.org/blog/2014/05/13/program-of-the-month-sfhelicon/

[PARAMETERS]
bool    | adj | =n |  [y/n] | 	if y, do adjoint operation 
bool    | div | =n |  [y/n] | 	if y, do inverse operation (deconvolution) 
file    | filt | = |   | 	auxiliary input file name
string  | lag | = |   | 	file with filter lags
ints    | n | = |   | 	 [dim]
[DIRECTORY]
user/gee
