Synopsis
		sfunif2 < surface.rsf > model.rsf x0= z0= v00= dvdx= dvdz= n1= d1= o1=0.

In each layer, velocity is a linear function of position.

Inspired by SU's unif2.

Parameters
		float d1= Sampling of the depth axis   floats dvdx= [ninf]   floats dvdz= [ninf]   int n1= Number of samples on the depth axis   float o1=0. Origin of the depth axis   floats v00= [ninf]   floats x0= [ninf]   floats z0= [ninf]

Used In
		GEO384W          hw1/simple hw3/blake hw4/times hw5/hyper   RSF          scons/rsf su/rsfmodel   SEP          angle/agmig oc2/cup