One healthy volunteer was scanned over two non‐stop 4 h sessions. The imaged volume comprised twenty 4 mm thick whole‐brain sagittal slices covering the corpus callosum left–right. The image size was 110×110 and the in‐plane resolution 2×2 mm2. 45 unique and evenly distributed diffusion directions (taken from http://www.camino.org.uk) were acquired for each shell, with both positive and negative polarities; these directions were the same in each shell. We also included 10 interleaved b=0 measurements, leading to a total of 100 measurements per shell. Each shell had a unique combination of Δ={22,40,60,80,100,120} ms, δ={3,8} ms and |G|={60,100,200,300} mT/m (see Table 1). The measurements were randomized within each shell, whereas the gradient strengths were interleaved. We inspected the images visually and did not observe any obvious shifts from gradient heating. The minimum possible echo time (TE) for each gradient duration and diffusion time combination was chosen to enhance signal‐to‐noise ratio (SNR) and potential estimation of compartment‐specific relaxation constants. The SNR of b=0 images was 35 at TE = 49 ms and 6 at TE = 152 ms. The SNR was computed by assessing the signal mean and noise variance across the selected WM voxels on multiple b=0 images. In both cases these estimates matched reasonably well. More details about the acquisition protocol can be found in Ferizi et al.42