Synopsis
		sfhelm2D_fwi < in.rsf > out.rsf receiver=receiver.rsf source=source.rsf record=record.rsf dip=dip.rsf niter=0 uts=0 npml=20 precond=n radius= order=

Parameters
		string dip= auxiliary input file name   int niter=0   int npml=20 PML width   string order= discretization scheme (default optimal 9-point)   bool precond=n [y/n]   int radius=   string receiver= auxiliary input file name   string record= auxiliary input file name   string source= auxiliary input file name   int uts=0