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Below the D ESS isoleg, All-D is ESS. Above the TFT isoleg, TFT is an ESS. Either D or TFT can be the ESS in the region between the D- and TFT-ESS isoleg, leading to alternative stable states. To right of the C-ESS isoleg, C can be an ESS. Parameter values: b = 1.65 and c = 1.
