Synopsis
		sfvirtualdata < in.rsf > out.rsf dif=dif.rsf verb=n stack=n both=n jumpo=1 jumps=1

Parameters
		bool both=n [y/n] receiver flag, if y, receiver with both sides   string dif= auxiliary input file name   int jumpo=1 jump in offset dimension, only for stack=n   int jumps=1 jump in shot dimension, only for stack=n   bool stack=n [y/n] stack flag, if y, no common multiple gather   bool verb=n [y/n] verbosity flag