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We denote the source wavefield by . Equation (13) can be written:
| |
(15) |

We then take a Taylor expansion of by considering *k*_{x}
small compared to :
| |
(16) |

Explicit finite differences are used to obtain a numerical solution:
| |
(17) |

| (18) |

where .

** Next:** Mixed domain
** Up:** Implementing the operator
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Stanford Exploration Project

7/8/2003