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Now let us be specific about what is meant by the lens term
in the present context of before-stack migration
in the presence of lateral velocity variation.
Specializing the DSR equation to 15 angles gives

| |
(17) |

Rearranging the terms to group by behavior gives
| |
(18) |

| (19) |

So you see the familiar type of lens term, but it has two parts,
one for shifting at the shot, and one for shifting at the geophone.

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Stanford Exploration Project

10/31/1997