Figure 3.

TFM data processing

(A) Merged images of beads at t = 0 min (red) and t = 20 min (blue). Inserts: reference image in red at t = 0 min, stressed image in blue at t = 20 min, white square indicating sub-image zone cropped and used for the PIV and FTTC calculations.

(B) Vector map of bead displacement obtained for t = 20 min after the PIV calculations over the sub-images.

(C) Gaussian smoothed map of stress norms obtained for t = 20 min after the FTTC calculations over the sub-images.

(D) Curves representing the sum of stresses (top) and the energy (bottom) over the sub-images vs. the time duration of the experiment.