Program sfpsss | phase shift wave extrapolation. 
[SYNOPSIS]
sfpsss < data.rsf > imag.rsf vel=modl.rsf wave=wave.rsf jz=40 rz=0 nz=nz0-rz
[PARAMETERS]
int     | jz | =40 |   | 	depth step for wave data 
int     | nz | =nz0-rz |   | 	depth number 
int     | rz | =0 |   | 	receiver depth 
file    | vel | = |   | 	auxiliary input file name
file    | wave | = |   | 	auxiliary output file name
[DIRECTORY]
user/chen
