Bifurcation diagram.

<p>Bifurcation diagram of the bath coupled reduced model for –variation. Color and line style conventions for fixed points and limit cycles are <a href="http://www.ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.1003941#pcbi-1003941-g002" target="_blank">Figs. 2</a> and <a href="http://www.ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.1003941#pcbi-1003941-g003" target="_blank">3</a>: black and green lines are fixed point and limit cycles, solid and dashed line styles mean stable and unstable sections. Stable solution on invariant tori are blue. They were obtained by direct simulations. The fixed point changes stability in HBs and LPs. The bifurcation types limit cycle undergoes are , period–doubling (PD) and torus bifurcation (TR). Some physiologically irrelevant unstable limit cycles are omitted (cf. text). Panel (<b>a</b>) shows the membrane potential, panel (<b>b</b>) shows the extracellular potassium concentration. (<b>b</b>) does not contain the limit cycle, because it can hardly be distinguished from the fixed point line.