Program sfvelmap | 2-D mapping from moving-object velocity to plane-wave slowness 
[SYNOPSIS]
sfvelmap < in.rsf > out.rsf osx=-0.5/dvx osy=-0.5/dvy nt=360 dt=0.5 ot=0.
[PARAMETERS]
float   | dt | =0.5 |   | 	line parameter increment 
int     | nt | =360 |   | 	number of line parameter for integration in [0,180]. 
float   | osx | =-0.5/dvx |   | 	
float   | osy | =-0.5/dvy |   | 	
float   | ot | =0. |   | 	line parameter origin 
[DIRECTORY]
user/browaeys
