Stable steady states for different parameter combinations.

<p>The letters indicate the steady states which are stable for a certain parameter combination, U - unpolarised, S - side polarised, T - triangular, S/T-bistable. The values for the feedback strength were chosen to cover all possible behaviour. The parameter values for Model A are shown in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0060064#pone.0060064.s007" target="_blank">Table S2</a>; the parameter values for Model L in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0060064#pone.0060064.s012" target="_blank">Table S7</a>. A vertex polarised steady state is never stable.