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. Author manuscript; available in PMC: 2012 Feb 15.
Published in final edited form as: Nat Commun. 2011 Aug 16;2:434. doi: 10.1038/ncomms1442

Figure 2. Robustness of results across parameter sets.

Figure 2

Shown are the results of 100,000 numerical calculations using N = 100, n = 5, c = 1 and randomly sampling from uniform distributions on the intervals 1 < r < 5, 0 < σ < (r-1)c, 0 < γ < 5, and γ < β < 5γ. Results are shown for (a) the no-punishment strategy set, (b) the restricted punishment strategy set where only cooperators can punish loners, and (c) the full punishment strategy set.