Program sfpp2psang | Transform PP angle gathers to PS angle gathers. 
[SYNOPSIS]
sfpp2psang < in.rsf > out.rsf vpvs=vpvs.rsf nw=4 inv=n
[COMMENTS]
* (designed for absolute offsets)

[PARAMETERS]
bool    | inv | =n |  [y/n] | 	if y, do inverse transform 
int     | nw | =4 |   | 	accuracy level 
file    | vpvs | = |   | 	auxiliary input file name
[DIRECTORY]
system/seismic
