Synopsis
		sftime2depth < in.rsf velocity=velocity.rsf > out.rsf intime=n nz= dz= z0=0. extend=4 slow=n twoway=y eps=0.01

July 2013 program of the month:
http://www.ahay.org/blog/2013/07/01/program-of-the-month-sftime2depth/

Parameters
		float dz= Depth sampling (default: d1)   float eps=0.01 stretch regularization   int extend=4 Interpolation accuracy   bool intime=n [y/n] y if velocity is in time rather than depth   int nz= Number of depth samples (default: n1)   bool slow=n [y/n] If y, input slowness; if n, velocity   bool twoway=y [y/n] if y, two-way traveltime   file velocity= auxiliary input file name   float z0=0. Depth origin

Used In
		CWP          geo2007StereographicImagingCondition/flat4 geo2007StereographicImagingCondition/gaus1 geo2008NumericWEMVAoperators/flatWEMVA geo2008NumericWEMVAoperators/saltWEMVA