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. Author manuscript; available in PMC: 2014 Aug 26.
Published in final edited form as: Biosystems. 2008 Apr 4;92(3):270–281. doi: 10.1016/j.biosystems.2008.03.007

FIG. 5.

FIG. 5

Steady state response for a subcritical signal Smax < Scrit for different initial conditions. The unstable state is a separatrix. The gray area denotes the forbidden region.