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Average population fitness 〈f〉 as a function of kA for a threshold response function. The left plot is an instance where the maximal fitness occurs at nonzero kA; the right plot shows an example where the maximum fitness occurs at kA = 0. In both plots, the parameters are α = −0.99, f∗ = 0.75, β0 = 1, and kB = 0.8; Δγ = 1 (left) and Δγ = 4 (right).
