Translations:Implementation of migration/3/en

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Let us give a example. We assume that the medium has a constant velocity, which we take to be one. Let the subsurface grid for depth points D be given by where depth is given by and horizontal distance is given by . Let the surface locations P be where . Suppose the source is We want to construct a table of one-way traveltimes, where depth z denotes the row and horizontal distance x denotes the column. The one-way traveltime from the source (1, 3) to the depth point is . For example, the traveltime from source to depth point is