Program sfsscrg | Extract common reciever gathers from simultaneous data 
[SYNOPSIS]
sfsscrg < in.rsf delay=delay.rsf > out.rsf jt=1 nt=n1
[PARAMETERS]
file    | delay | = |   | 	auxiliary input file name
int     | jt | =1 |   | 	subsampling [nps] in observation 
int     | nt | =n1 |   | 	
[DIRECTORY]
user/chen
