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Level of differentiation. The level of differentiation among hosts measured as FST. The empty symbols denote the results for the island model, while the full symbols correspond to scale-free networks. The parameters are e = 0.01 (circles) and e = 0.02 (triangles), D = 1000, Nd = 10, nt = 50, nd = 5 and μ = 0.0004.
