Detail of bifurcations. Similar to Figure 2 but now showing the fine structure of branches bounding the stability region. The points ZH and HH correspond with the fold-Hopf and Hopf-Hopf bifurcations from Equations 22 and 23. For clarity, we do not show the stability region. Blue, fold/transcritical; red, asymmetric Hopf; magenta, symmetric Hopf.