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a) The clustering of memories versus age, after the bottom arrow in Fig. 8. b) The average modularity versus age predicted by quasispecies theory (solid). Here, the fitness is 10× the overlap in Fig. 8, and the rate of mutation is μ = 0.1 [46]. Also shown is the adiabatic approximation to the modularity, M∞ (dashed) as well as the modularity that maximizes the fitness, M* (dotted).
