Program sfweigwf | 3-D wave-equation wavefield continuation with adjoint-source 
[SYNOPSIS]
sfweigwf slo=Fslo.rsf < Fsou.rsf coo=Fcoo.rsf > Fwfl.rsf verb=n down=y causal=n
[PARAMETERS]
bool    | causal | =n |  [y/n] | 	causality flag 
file    | coo | = |   | 	auxiliary input file name
bool    | down | =y |  [y/n] | 	up/down   flag 
file    | slo | = |   | 	auxiliary input file name
bool    | verb | =n |  [y/n] | 	verbosity flag 
[DIRECTORY]
user/psava
