Program sfwavmod | 1-2-3D finite difference modeling 
[SYNOPSIS]
sfwavmod < in.rsf vel=vel.rsf sgrid=sgrid.rsf ggrid=ggrid.rsf > dat.rsf wfl=wfl.rsf jt=1 jtm=100 ot=0.0 verb=n
[PARAMETERS]
file    | ggrid | = |   | 	auxiliary input file name
int     | jt | =1 |   | 	time interval in observation system 
int     | jtm | =100 |   | 	time interval of wave movie 
float   | ot | =0.0 |   | 	time delay 
file    | sgrid | = |   | 	auxiliary input file name
file    | vel | = |   | 	auxiliary input file name
bool    | verb | =n |  [y/n] | 	verbosity 
string  | wfl | = |   | 	wavefield movie file (auxiliary output file name)
[DIRECTORY]
user/chen
