Fig. 7.

The figure depicts a situation when for $q=0$ (a) the disease is endemic in patch one but dies out in patch 2. For $q=0.05$ (b), the disease is endemic in both patches. Parameters are the same as in Fig. 6, only the transmission rates are modified to ${\mathit{\beta }}_1=0.165$ and ${\mathit{\beta }}_2=0.145$. For a better visualization, we started with large density of infection in patch two