Program sfahelicon | Apply multidimensional nonstationary filter on a helix. 
[SYNOPSIS]
sfahelicon < in.rsf filt=filt.rsf > out.rsf n= dim=ndim lag=
[PARAMETERS]
int     | dim | =ndim |   | 	number of dimensions 
file    | filt | = |   | 	auxiliary output file name
string  | lag | = |   | 	file with filter lags
ints    | n | = |   | 	 [dim]
[DIRECTORY]
user/gee
