Program sfmute | Mute a triangle region 
[SYNOPSIS]
sfmute < in.rsf > out.rsf t1=t0 v1=v0+(n2-1)*dv band=20*dt
[PARAMETERS]
float   | band | =20*dt |   | 	start time 
float   | t1 | =t0 |   | 	start time 
float   | v1 | =v0+(n2-1)*dv |   | 	end velocity 
[DIRECTORY]
user/dmerzlikin
