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I have been very careful not to make a distinction between
prestack and poststack
algorithms: all of the above applies to both domains. The prestack version
use the dispersion relation in a form that solves for .Sources and receivers are downward continued in depth by calculating

| |
(2) |

where *k*_{x,s} and *k*_{x,g} are spatial frequencies in shot-geophone
coordinates.
Again *F* depends on
the exact anisotropic dispersion relation or its double elliptic approximation.

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Stanford Exploration Project

12/18/1997