Program sffdtacc | 2-D Fourth-order Finite-difference wave extrapolation with timing option (no ABC)
[SYNOPSIS]
sffdtacc < Fw.rsf vel=Fv.rsf ref=Fr.rsf > Fo.rsf verb=0 timer=0
[PARAMETERS]
file    | ref | = |   | 	auxiliary input file name
bool    | timer | =0 |  [y/n] | 	setup I/O files 
file    | vel | = |   | 	auxiliary input file name
bool    | verb | =0 |  [y/n] | 	
[DIRECTORY]
user/jsun
