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Evolution of cooperation with institutional punishment and absolute payoffs. Top row depicts the stationary fraction of cooperators as a function of the average amount of available incentives δ for different values of the distribution strength α. The enhancement factor is r = 1 in (A) and r = 2 in (B). Bottom row depicts the contour plot of the fraction of cooperators as a function of α and δ, as obtained for the enhancement factor r = 1 in (C) and r = 2 in (D).
