Program sfofd1 | 1-D Optimized finite-difference wave extrapolation 
[SYNOPSIS]
sfofd1 < in.rsf G=Gmatrix.rsf vel=vel.rsf > out.rsf isx=(int)(nx/2) nt= dt=
[PARAMETERS]
file    | G | = |   | 	auxiliary input file name
float   | dt | = |   | 	
int     | isx | =(int)(nx/2) |   | 	
int     | nt | = |   | 	
file    | vel | = |   | 	auxiliary input file name
[DIRECTORY]
user/songxl
