Fig. 9.

Convergence analysis for the deterministic model investigating the effects of PDE time step and spatial discretization for each value of $\mathbf{D}$. Results are plotted for PDE time steps of 0.1 ms (red), 0.05 ms (green), 0.025 ms (blue), 0.01 ms (black), 0.005 ms (cyan) and 0.0025 ms (yellow). (A) shows results with D=1.171 cm² s⁻¹, (B) D= 0.586 cm² s⁻¹, (C) D= 0.117 cm² s⁻¹, and (D) D= 0.059 cm² s⁻¹. The axes on plot (D) have been rescaled to better display the results. The conduction velocity is not plotted where a propagation failure occurs. (For interpretation of the references to colour in this figure caption, the reader is referred to the web version of this paper.)