Program sflffd1_10 | 1-D Lowrank Fourier finite-difference wave extrapolation 
[SYNOPSIS]
sflffd1_10 < in.rsf vel=vel.rsf G=Gmatrix.rsf > out.rsf nt= dt= factor=0.5
[PARAMETERS]
file    | G | = |   | 	auxiliary input file name
float   | dt | = |   | 	
float   | factor | =0.5 |   | 	
int     | nt | = |   | 	
file    | vel | = |   | 	auxiliary input file name
[DIRECTORY]
user/songxl
