This is an example how to fit the gridded velocities and the gridded interfaces by a model with interfaces, suitable for ray tracing.
We take the gridded velocities and interfaces of the data set 'hess.dat', provided by Amerada Hess, and build the 2-D model suitable for ray tracing.
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Bulant, P., Klimes, L. & Zacek, K.: Sobolev scalar products in the construction of velocity models. Extended Abstracts of 63rd EAGE Conference (Amsterdam), O-24, EAGE, Houten, 2001.