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Misfit to the InSAR displacement data for each pair of variables in equation (22), as evaluated by the reduced χ 2 statistic. Blue and white contour lines of equal χ 2 correspond to the regions of 95% and 68% confidence, respectively, as determined by an F test. White star indicates the global minimal χ 2 value found in the 3‐D grid search. Each red dot corresponds to one run of the forward model and evaluation of the misfit.
