Program sfprekirchsr | 2-D Prestack Kirchhoff time migration with antialiasing in source-receiver domain. 
[SYNOPSIS]
sfprekirchsr vel=vel.rsf < inp.rsf > outp.rsf nz=nt dz=dt z0=t0 adj=n antialias=1.0
[COMMENTS]
The axes in the input are {time,receiver,source}
The axes in the output are {time,receiver}
I(t0,x0)=\int (W(t0,y0,s,r) * u(s,r,T(s,t0,x0)+T(r,t0,x0)) dsdr

[PARAMETERS]
bool    | adj | =n |  [y/n] | 	
float   | antialias | =1.0 |   | 	antialiasing 
float   | dz | =dt |   | 	
int     | nz | =nt |   | 	
file    | vel | = |   | 	auxiliary input file name
float   | z0 | =t0 |   | 	
[DIRECTORY]
user/chenyk
