FIG. 10.

Blowup of bifurcation diagram in Fig. 9 for small cross immunity $ϵ$ and ADE $\varphi$. Curves indicate location of Hopf bifurcations. Only region I has stable steady states. The inset shows the period of a branch of unstable orbits as a function of $ϵ$ for $\varphi \approx 3.877$ in region II. See text for details.