Program sfclfd1 | 2-D Fourth-order Optimized Finite-difference wave extrapolation 
[SYNOPSIS]
sfclfd1 > out.rsf < ini.rsf G=G.rsf dt= nt= mode=0 cpxexp=y
[PARAMETERS]
file    | G | = |   | 	auxiliary input file name
bool    | cpxexp | =y |  [y/n] | 	
float   | dt | = |   | 	
int     | mode | =0 |   | 	
int     | nt | = |   | 	
[DIRECTORY]
user/jsun
