Program sfshifts2 | Apply linear time shifts on multiple traces. 
[SYNOPSIS]
sfshifts2 < in.rsf > shift.rsf s0= ds=
[PARAMETERS]
int     | ds | = |   | 	shift sampling 
int     | s0 | = |   | 	first shift (in number of samples along 1st axis) 
[DIRECTORY]
user/zgeng
