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In this section I show some preliminary results from testing the two proposed strategies. The main operator H is the hyperbola superposition operator. The adjoint ${\bf H^T}$ is the hyperbolic Radon transform Guitton (2000b); Nichols (1994). The model space m is called the velocity space. The input data d are CMP gathers. The process of computing the model m minimizing Equation 12 is called velocity inversion.


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