Fig. 6.

Spiral wave initiation due to an asymmetric FPR. The parameter $A$ is fixed to $A=\hspace{0.17em}0.5A_0$ everywhere except the circular region, where $A=A_0=\hspace{0.17em}2$ (dense filling) and $A=\hspace{0.17em}0.75A_0$ (rare filling). Snapshots of a wave propagating from left to right are shown. (A–F) The trajectories of two created spiral tips are shown by white solid and dotted lines in B–F. One spiral tip disappears due to the collision with the medium’s boundary (dotted line). The trajectory of the remaining spiral tip is shown in C–F (white solid line).