Synopsis
		sfdsreiko < in.rsf > out.rsf mask=mask.rsf flag=flag.rsf alpha=alpha.rsf velocity=y thres=5.e-5 tol=1.e-3 nloop=10 causal=y

Parameters
		string alpha= auxiliary output file name   bool causal=y [y/n] if y, neglect non-causal branches of DSR   string flag= auxiliary output file name   string mask= auxiliary input file name   int nloop=10 number of bisection root-search   float thres=5.e-5 threshold (percentage)   float tol=1.e-3 tolerance for bisection root-search   bool velocity=y [y/n] if y, the input is velocity; n, slowness squared

Used In
		TCCS          dsrtomo/accuracy dsrtomo/causal dsrtomo/hessian dsrtomo/marm