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If you are using finite differences on depth,
or travel-time depth,
then we have the relation (46):

which can be used in .Since dissipation may be present,
the quantities above may be complex.
Let *N*_{z} be the number of depth layers,
generally equal or less than *N*_{t}.
Adapting (49) to (59) gives
| |
(60) |

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Stanford Exploration Project

10/31/1997