Pseudocolor plots of with MF-composite inhomogeneities:

<p> Pseudocolor plots of the transmembrane potential of the myocyte at time, s, in the presence of three square MF-composite inhomogeneities with sides (a) , (b) , and (c) , for the case of zero-sided coupling; the bottom-left corner of these squares is fixed at ; the white solid lines in these figures show the spiral-tip trajectories in the time interval and the local time series data are recorded from points that are shown by asterisks. <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0072950#pone.0072950.s008" target="_blank">Video S7</a> illustrates the spatiotemporal evolution of these spiral waves. The plots in (d)-(f) show the time series for , in the interval , which are obtained from the point outside the inhomogeneity and a point inside it , represented by black filled circles and red filled triangles, respectively; (g), (h), and (i) show plots of the inter-beat intervals (ibis) versus the beat number for the time series of mentioned above; each one of these time series contain data points; the power spectra , which follow from these time series, are given in (j), (k), and (l).