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. 2011 Jun 13;108(28):11375–11380. doi: 10.1073/pnas.1105604108

Fig. 6.

Fig. 6.

Proportion of force raids in which free riding in the form of cowardice and desertion was noticed and norms regarding loot-sharing were not followed. The estimate for desertion is based on 49 force raids that were initiated, cowardice is based on 40 force raids in which combat occurred, and loot division is based on 32 force raids in which the raiding party was successful. Error bars show one SE.