Figure 4.

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A simulated stable counterclockwise rotating rotor and its break-down. (A) A 15 × 15 cm computational domain, with spatial resolution Δx = 0.5 mm, contains a stable rotor with a meandering spiral tip path shown in red. The rotor was simulated using the 3-variable FK model (parameter set #3 from Ref. 24) and the break-down of the spiral was generated by assigning a different value of one of the parameters in the outer region of the computational domain (τ_r = 0.4 vs. τ_r = 0.27). Scalebar = 2 cm. (B) Isochronal map using a spatial resolution of Δx = 6 mm, as indicated by the scalebar, using the data from A. (C) Snapshot of an isochronal map on a 12 × 12 grid. The scale bar represents the spatial resolution (Δx = 12.5 mm). (D) Snapshot of an isochronal map on a 15 × 15 grid from an animated sequence. All isochronal maps used an isochronal interval of ΔI = 20 ms (enhanced online) .