Bifurcation diagram for state-variables (solid) and (dashed).

<p> and are complementary outputs, when one is high the other is low. Red (black) indicate stable (unstable) fixed points. System is bistable for . For , is high and is low. Calculated for <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0076032#pone.0076032.e066" target="_blank">Eqs. (2)</a>–<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0076032#pone.0076032.e067" target="_blank">(3)</a> with , , , , , and .