Program sfcigangle | src-receiver to angle gathers 
[SYNOPSIS]
sfcigangle < dist.rsf time=time.rsf dept=dept.rsf > imag.rsf data=data.rsf nalpha=90 tolz=1.f
[PARAMETERS]
file    | data | = |   | 	auxiliary input file name
file    | dept | = |   | 	auxiliary input file name
int     | nalpha | =90 |   | 	
file    | time | = |   | 	auxiliary input file name
float   | tolz | =1.f |   | 	surface depth 
[DIRECTORY]
user/roman
