Synopsis
		sftomo < time.rsf > slow.rsf adj=n niter=100 eps=1. tol=1.e-7 rect1=1 rect2=1 np=11 ns=1 ds=nz

Parameters
		bool adj=n [y/n] if n, generate traveltime from slowness; if y, invert slowness from traveltime   int ds=nz step size   float eps=1. scaling parameter   int niter=100 maximum number of iterations   int np=11   int ns=1 number of depth steps   int rect1=1   int rect2=1 smoothing length in z and x   float tol=1.e-7 tolerance for stopping iterations