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Spatial brain‐mask regularization. (A) To remove marginal non‐brain slices, a parabola is fitted to the major axes of the central 50% of brain‐mask slices, that is, typically the largest slices (shaded area). (B) Normalized deviation of measured axis lengths from the fit. Slices with z‐scores exceeding z poly = 1.5 (red line, derived empirically) are discarded as indicated by red circles
