Probability distribution of the single particle diffusion coefficient at different time, rescaled by the average diffusivity, at T = 0.6 and t = 0.2, 1.4, 4, 5.2, 11, 25 with (inset) and at T = 0.45 and t = 0.65, 4.3, 7.7, 15, 29 with (main panel). At low temperature and intermediate time, the distribution acquires a temporary bimodal shape with the maxima occurring at and , respectively. All data refer to species a of the KALJ mixture. Analogous results for species b are shown in Fig. S4.