Synopsis
		sfhelm2D_lsm < in.rsf > out.rsf misfit=misfit.rsf receiver=receiver.rsf source=source.rsf record=record.rsf uts=0 npml=20 niter=0 order=

Parameters
		file misfit= auxiliary output file name   int niter=0 Number of iterations   int npml=20 PML width   string order= discretization scheme (default optimal 9-point)   string receiver= auxiliary input file name   string record= auxiliary input file name   string source= auxiliary input file name   int uts=0