# Translations:Implementation of migration/32/en

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We obtain Table 3 by adding Tables 1 and 2 entry by entry. Table 3 gives the two-way traveltimes. For example, the traveltime from source (1, 3) to depth point (4, 6) and back to receiver (1, 11) is . This number (rounded) appears in the fourth row, sixth column of Table 3. A contour map of Table 3 would reveal that the contour lines are elliptical curves of constant two-way traveltime for the given source and receiver pair.