Fig. 15.

Two-parameter bifurcation diagram of the fast system of Equations 9a-9c in the -plane. This includes loci of saddle-nodes of fixed points SNf, Hopf bifurcations H, saddle-nodes of periodic orbits SNp, and homoclinic bifurcations HC. There are three labeled codimension-2 bifurcations: a Bogdanov-Takens bifurcation BT at , a Bautin bifurcation B at , and a SNpHC at . Plotting conventions follow Figure 6.