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Regularization analysis. (a) Median accuracy. Error bars are comparable across label sets and indicate SD over subjects. (b) Proportion of voxels where the warp ϕ folds, i.e. det (Jϕ)≤0 for voxel Jacobian Jϕ (0 for λ>1; of 4.9 × 106 voxels). (c) Average Jacobian determinant. For λ ≥ 1, the deviation from the ideal value 1 is less than 2 × 10−3.
