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. 2013 Apr 4;9(4):e1003001. doi: 10.1371/journal.pcbi.1003001

Figure 11. Robustness of cooperative adaptive networks.

Figure 11

Changes in the fitness value (ordinate) under mutations (red Inline graphic) or noise (blue Inline graphic), for evolved networks with different average adaptiveness (abscissa). We first evolved networks with Inline graphic, Inline graphic, and Inline graphic, and then sampled those networks with fitness values Inline graphic. We repeated Inline graphic different runs of evolutions to sample such fitted networks, and collected a total of 20,038 networks. We then made a histogram of average adaptiveness values with a bin size of 0.04. For networks in each bin, we removed a single path directly connecting any 2 genes. We computed the fitness values for such emulated networks over all possible removals of single paths. After averaging all networks in the average adaptiveness of a given bin, the average fitness value by mutation was obtained. Also, instead of mutations, we added a noise term in the model as mentioned in the text, with the noise amplitude Inline graphic, and computed the fitness. Again, by averaging over the networks in a given bin of average adaptiveness, the fitness under noise is obtained. The original fitness values are shown with green Inline graphic symbols.