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(a) (b) Electronic Supplementary Material Fig. 1 Estimated probability of number of subgroups k (goodness of fit computed as lnPr (X|K) for the investigated set of 183 cultivars studied with two marker types (a) 22 SSRs, and (b) 253 DArTs. The ln likelihood L(K) mean values determined by STRUCTURE are plotted against the assumed number of subgroups (k1 to k20).