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Fig. 3 —Graph shows fractional anisotropy (FA) for peripheral and deep white matter throughout first year of life. Each symbol represents mean peripheral () or deep () white matter FA values for one subject. At right of each graph are adult mean ± standard error of the mean. For each data set, values were fit by broken-line linear regression functions with break points at 100 days. As with apparent diffusion coefficient (Fig. 2), rates of change in FA were greater in the first 3 months compared with the rest of the year, as indicated by steeper slopes of initial linear fits compared with second fitted regression lines.