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Group level comparison of FA values in white (a) and grey (b) matter ROIs of upper part of C2 (i.e. upper slice in C2 ROI) and lower part of C4 (i.e. lower slice in C4 ROI) when using methods (i)–(vi). For both group comparisons the median and standard error of the mean (sem) across subjects are depicted. Using method (vi) leads to increased WM-FA and decreased GM-FA values.
