Figure 2 shows the DW signal attenuation for each shell in the genu dataset, with stars in the legend indicating which shells were left out for testing. In this plot, a small number of data appear as ‘outliers’ (two such data are shown with arrows in the bottom‐left subplot of Figure 2). Specifically, we counted about 10 of them among more than 4812 measurements, most of them being in the b=300 s/mm2 shell. Since these outliers appear to be specific to the b=300 s/mm2 shell and are not in other shells with similar b value, we attribute them to a momentary twitching of the subject rather than more systematic effects, such as perfusion.