Synopsis
		sfpassive2d < in.rsf > out.rsf velocity=vel.rsf wave=wave.rsf verb=n adj=n pas=n abc=n snap=0 depth=0 nt= dt= cb=0.0f

Parameters
		bool abc=n [y/n] absorbing boundary condition   bool adj=n [y/n] adjoint flag, 0: modeling, 1: migration   float cb=0.0f   int depth=0 surface   float dt=   int nt=   bool pas=n [y/n] passive flag, 0: exploding reflector rtm, 1: passive seismic imaging   int snap=0 wavefield snapshot flag   file velocity= auxiliary input file name   bool verb=n [y/n] verbosity flag   file wave= auxiliary output file name