Fig. 2.

Stationary profile of a front initially propagating from left to right and stopped due to a jump in the medium’s parameters at $x=\hspace{0.17em}0$. Numerical simulations of a slightly modified Barkley model (Eqs. 1–4) with $ϵ=\hspace{0.17em}0$. (A) $D=\hspace{0.17em}1$ for $x<\hspace{0.17em}0$, $D=\hspace{0.17em}2$ for $x>\hspace{0.17em}0$ and $A=\hspace{0.17em}1$ everywhere. (B) $A=\hspace{0.17em}1$ for $x<\hspace{0.17em}0$, $A=\hspace{0.17em}2$ for $x>\hspace{0.17em}0$, and $D=\hspace{0.17em}1$ everywhere.