Program sfautocorr | Autocorrelation for helix filters. 
[SYNOPSIS]
sfautocorr < in.rsf > out.rsf lag=lag0.rsf lagout=lag.rsf
[PARAMETERS]
string  | lag | = |   | 	optional input file with filter lags (auxiliary input file name)
string  | lagout | = |   | 	auxiliary output file name
[DIRECTORY]
user/gee
