Program sflffd2_an_25 | 2-D Fourier finite-difference wave extrapolation 
[SYNOPSIS]
sflffd2_an_25 > out.rsf < source.rsf velz=velz.rsf velx=velx.rsf yita=yita.rsf seta=seta.rsf G=G.rsf paras=paras.rsf s1=files1.rsf s2=files2.rsf dt= nt= isx= isz= ax=2.0 az=2.0 factor=1.0 err=0.0001 de=y
[PARAMETERS]
file    | G | = |   | 	auxiliary input file name
float   | ax | =2.0 |   | 	suppress HF parameter
float   | az | =2.0 |   | 	suppress HF parameter
bool    | de | =y |  [y/n] | 	
float   | dt | = |   | 	
float   | err | =0.0001 |   | 	suppress HF parameter
float   | factor | =1.0 |   | 	suppress HF parameter
int     | isx | = |   | 	
int     | isz | = |   | 	
int     | nt | = |   | 	
file    | paras | = |   | 	auxiliary input file name
file    | s1 | = |   | 	auxiliary input file name
file    | s2 | = |   | 	auxiliary input file name
file    | seta | = |   | 	auxiliary input file name
file    | velx | = |   | 	auxiliary input file name
file    | velz | = |   | 	auxiliary input file name
file    | yita | = |   | 	auxiliary input file name
[DIRECTORY]
user/songxl
