sfsstep2 (2.0-git)
3-D post-stack modeling/migration with extended split step.

        sfsstep2 < in.rsf > out.rsf slowness=vel.rsf inv=n verb=n eps=0.01 nt=1 nr=1 padx=0 pady=0 dt=0.004 nw= dw= w0=0.

float dt=0.004
time error
float dw=
Frequency sampling (for modeling)
float eps=0.01
stability parameter
bool inv=n [y/n]
If y, modeling; if n, migration
int nr=1
maximum number of references
int nt=1
taper size
int nw=
Length of frequency axis (for modeling)
int padx=0
cross-line padding
int pady=0
in-line padding
file slowness=
auxiliary input file name
bool verb=n [y/n]
verbosity flag
float w0=0.
Frequency origin (for modeling)