Transverse propagation of simulated cardiac APs in the 10 × 10 network when the entire A-chain was stimulated simultaneously. Only two examples are depicted out of the total of 16 combinations that were run. A: The ratio of longitudinal to transverse gj-channels was 0/0, B: The ratio of longitudinal to transverse gj-channels was 100/100. As in Figures 3 and 4, the records from only 3 cells (cells #1, 5, and 10) in each chain are shown. The sequence of firing of the 15 cells selected is given in the inset table in each panel. When the sequence of the cells is in order there is a zigzag pattern, because the transverse gj-channels were inserted only at the ends of each chain.