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The histograms (median with the interquartile range) of control subjects (blue line) and SCA2 patients (red line) groups of DTI-derived indices of cerebrum (a) and cerebellum-brainstem (b) are shown. The bin width is 0.05×10−3 mm2/s for MD/AD/RD, 0.03 for FA and 0.08 for MO. MD/AD/RD (median, peak location) and FA/MO (median, peak location) are reported as 10−3 mm2/s and unitless, respectively.
