Plots illustrating regional MWF, FA, MD, RD, or AxD values as a function of age for five representative cerebral white matter ROIs: whole brain (WB) WM, frontal (FL), occipital (OL), parietal (PL), and temporal (TL) lobes WM. For each ROI, the coefficient of determination, R2, is reported. Plots of all ROIs can be found in the Supplementary Material (Figs. S1–S5).