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. 2009 Jun 2;106(24):9564–9569. doi: 10.1073/pnas.0812260106

Fig. 4.

Fig. 4.

Free fitness landscape projected onto the morphogen steepness α as a function of populations size N, where each plot for a given value of N is offset vertically for clarity. Analogous to the free energy, local maxima in free fitness represent local equilibrium states; upon increasing the population size N, we see a change in the dominance of the low α-phenotype to the high α-phenotype.