Program sffrog | Simple 2-D wave propagation 
[SYNOPSIS]
sffrog < Fw.rsf > Fo.rsf vel=Fv.rsf ref=Fr.rsf verb=n type=0
[PARAMETERS]
file    | ref | = |   | 	auxiliary input file name
int     | type | =0 |   | 	Laplacian type 
file    | vel | = |   | 	auxiliary input file name
bool    | verb | =n |  [y/n] | 	verbosity 
[DIRECTORY]
user/gee
