Movie S2.

The two different propagations, MF-CM (fast) and MF-MF (slow), as shown in Figure 2 B-C, are represented by the Fluo-4 raw video (left) and the processed dF/F (middle) and binary (right) videos. The spontaneous activity of the CMs before the stimulation is shown, followed by the optically induced AP (immediately after the laser pulse), and then the slow MF-MF propagation.