Figure 14.

Heat map of ${\mathcal{R}}_0$ as a function of control parameters, where ${\mathcal{R}}_0<1$ in the colourless region. (a) ${\mathcal{R}}_0$ as a function of θ and $\epsilon$, (b) ${\mathcal{R}}_0$ as a function of θ and ϕ and (c) ${\mathcal{R}}_0$ as a function of ϕ and $\epsilon$. The remaining parameters are fixed as shown in table 2.