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Upper panel (A–E), make response to S2 stimulation during diastole at an S1–S2 coupling interval of 300 ms for S1 propagation transverse to the fibre direction The S1 planar wave spreads from the lower left to the upper right. For the detailed description, refer to the legend for Fig. 1. Isochrones in E are drawn every 4 ms. Lower panel (A′–E′), intermediate make–break response to the stimulus at a S1–S2 coupling interval of 218 ms. Isochrones in E′ are drawn every 5 ms.
