The mean partitions for analyses of the Mus musculus data (Orth et al. 1998). Analyses were performed in which the number of populations was fixed (K = 1, K = 2, K = 3, K = 4, K = 5, K = 6, K = 7) or in which the number of populations was a random variable with a Dirichlet process prior [E(K) = 2, E(K) = 5, E(K) = 10, E(K) = 20]. The assignment of individuals (boxes) is indicated by color.