Synopsis
		sfgsray2rays2d < time.rsf dept=dept.rsf ang=angl.rsf slow=slow.rsf slowz=slowz.rsf slowx=slowx.rsf ref3=fref3.rsf > imagt.rsf stride=1 tolz= tolx= tola= ref1= ref2=

Parameters
		file ang= auxiliary input file name   file dept= auxiliary input file name   string ref1=   string ref2=   string ref3= auxiliary input file name   file slow= auxiliary input file name   file slowx= auxiliary input file name   file slowz= auxiliary input file name   int stride=1   float tola=   float tolx=   float tolz=