Fig. 11

Two parameter bifurcation diagram of the fast system of Equations 6a-6c. The loci of saddle-nodes of fixed points SNf merge in a cusp bifurcation C at $(y,g_{\mathrm{Ca}})\simeq (0.1133,0.7016)$, which creates the locus of Hopf bifurcations H. The saddle-node of periodic orbits SNp emerge from the Bautin bifurcation B at $(y,g_{\mathrm{Ca}})\simeq (0.3238,0.6418)$ and extend to the saddle-node separatrix loop bifurcation SNSL at $(y,g_{\mathrm{Ca}})\simeq (0.06972,1.397)$, which also creates a locus of homoclinic bifurcations HC. There is a SNIC bifurcation on the segment of SNf between C and SNSL. Plotting conventions follow Figure 6.