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Compensation mechanisms for period and duty-cycle level sets in a–h parameter space of the FHN model. A1 and B1: superimposed voltage traces. A2 and B2: superimposed phase planes. A3 and A4 and B3 and B4: superimposed v-speed graphs. All solid and dashed curves correspond to the parameter values indicated in the key (top). For all conditions, α = 4, λ = 0.1, and ε = 0.01.
