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Here I applied preconditioning on the helix using the following fitting goals Fomel (1997):
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(5) |

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| (6) |

In this case, a 2D PEF was estimated on the dense tracks and applied as regularization to the sparse tracks. This greatly improved the speed of convergence to create Figure 15.
**madfig7
**

Figure 15 Result of fitting goal 6 applied to both sparse and dense data together usinga 2D PEF estimated on dense data.

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Stanford Exploration Project

6/8/2002