Synopsis
		sfmpifwigrad Fvel=Fv.rsf Fwavelet=Fw.rsf Fadj=Fadj.rsf Fgrad=Fgrad.rsf Fwfl1=Fwfl1.rsf Fwfl2=Fwfl2.rsf ns= ds= s0= sz=5 nr=nx dr=dx r0=x0 rz=5 frectx=2 frectz=2 nb=100 coef=0.002

Parameters
		file Fadj= auxiliary input file name   file Fgrad= auxiliary output file name   file Fvel= auxiliary input file name   file Fwavelet= auxiliary input file name   file Fwfl1= auxiliary output file name   file Fwfl2= auxiliary output file name   float coef=0.002 absorbing boundary coefficient   float dr=dx receiver interval   float ds= shot interval   int frectx=2 source smoothing in x   int frectz=2 source smoothing in z   int nb=100 boundary width   int nr=nx number of receiver   int ns= shot number   float r0=x0 receiver origin   int rz=5 receiver depth   float s0= shot origin   int sz=5 source depth