Program sfpreconstkirch | Prestack Kirchhoff modeling/migration in constant velocity. 
[SYNOPSIS]
sfpreconstkirch < in.rsf > out.rsf inv=n zero=n aal=y nh= dh= h0= vel=
[COMMENTS]

Requires the input to be in (time,cmp x,cmp y,offset)

[PARAMETERS]
bool    | aal | =y |  [y/n] | 	if y, apply antialiasing 
float   | dh | = |   | 	offset sampling 
float   | h0 | = |   | 	offset origin 
bool    | inv | =n |  [y/n] | 	if y, modeling; if n, migration 
int     | nh | = |   | 	number of offsets 
float   | vel | = |   | 	velocity 
bool    | zero | =n |  [y/n] | 	if y, stack in migration 
[DIRECTORY]
system/seismic
