Program sfexgr | Exact group velocity in VTI media 
[SYNOPSIS]
sfexgr > out.rsf aq=14.47 bq=2.28 cq=9.57 dq=4.51
[PARAMETERS]
float   | aq | =14.47 |   | 	
float   | bq | =2.28 |   | 	
float   | cq | =9.57 |   | 	
float   | dq | =4.51 |   | 	
[DIRECTORY]
user/fomels
