Program sfofd1_5 | 1-D Optimized finite-difference wave extrapolation 
[SYNOPSIS]
sfofd1_5 < in.rsf G=Gmatrix.rsf vel=vel.rsf > out.rsf nt= dt=
[PARAMETERS]
file    | G | = |   | 	auxiliary input file name
float   | dt | = |   | 	
int     | nt | = |   | 	
file    | vel | = |   | 	auxiliary input file name
[DIRECTORY]
user/songxl
