Pseudocolor plots of the local membrane potential illustrating plane-wave propagation through a mural slice of our 2D simulation domain with a random distribution of myocytes and fibroblasts.

<p>Here we consider the moderate-coupling case cm²/ms, and and in (a.1)–(a.5) the percentage of fibroblasts , in (b.1)–(b.5) , in (c.1)–(c.5) , in (d.1)–(d.5) , in (e.1)–(e.5) , and in (f.1)–(f.5) . (For full spatiotemporal evolutions see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0045040#pone.0045040.s001" target="_blank">Video S1</a>.).