Figure 2: Top: space-time plots of the evolution of deformation activity as deduced from DIC; bottom: space- time plots of deformation activity as obtained from simulation; center: corresponding force vs. time/strain curves (black: experiment, red: simulation), the simulated curves have been corrected for friction effects as detailed in the Supplementary Material. (a) represents a sample deformed at ˙ e$_{ext}$ = 5 . 77 × 10 − 3 s − 1 , (b,c) samples deformed at ˙ e$_{ext}$ = 2 . 56 × 10 − 2 s − 1 ; experimental data for deformation of samples (a) and (b) are also shown in Supplementary Movies 1 and 2. 7