Synopsis
		sfmpictshiftlr left=left.rsf right=right.rsf dt=0.001 nb=60 par=0.01 cmplx=n abc=y pad1=1 taper=y thresh=0.92

Parameters
		bool abc=y [y/n] absorbing boundary condition   bool cmplx=n [y/n] use complex FFT   float dt=0.001 time interval   file left= auxiliary input file name   int nb=60 boundary width   int pad1=1 padding factor on the first axis   float par=0.01 absorbing boundary coefficient   file right= auxiliary input file name   bool taper=y [y/n] tapering   float thresh=0.92 thresholding