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Let Figure 90 represent the vertical section of the subsurface, with Ox being the line of pickup locations, so that, as usual, x represents the algebraic distance on the surface between the shot-point 0 and the typical pickup location P. The horizontal lines Ss'S: and S2'S2 represent the traces of two horizontal plane interfaces, the first of which forms the lower boundary of a medium of thickness, hl, in which the seismic velocity is Vl. Immediately below this medium is a second medium of thickness, h2, in which the velocity is V2 and which is bounded by the planes whose traces are S1's, and S2'S2.

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