Synopsis
		sfovc < in.rsf > out.rsf eps=0.1 nv=1 lagrange=n v0=0. vmax=

Axis order: t, p, x

Parameters
		float eps=0.1 stretch regularization   bool lagrange=n [y/n] Use Lagrangian method   int nv=1 number of velocity steps   float v0=0. starting velocity   float vmax= end velocity