Examples of unipolar electrograms during transverse propagation. In each panel, three electrogram waveforms are displayed; from left to right: punctual electrode (no filtering), electrode with diameter 0.96 mm (no filtering), electrode with diameter 0.96 mm (filtered). Dots are placed on the turning points contributing to the number of deflections. (A) control; (B) 40% sodium channel blockade; (C) 80% sodium channel blockade; (D) transverse coupling reduced by a factor of 2; (E) idem, by a factor of 19.3 (these electrograms are amplified by 3); (F) microfibrosis with density D=10% and length of collagenous septa L=315 μm; (G) idem, with D=20% and L=630 μm; (H)–(J) idem, with D=30% and L=945 μm.