Fig. 1. First two principal axes (PA1 and PA2) of Kruskal's nonmetric multidimensional scaling for comparison of Euclidean (d_E), Rogers' (d_R), modified Rogers' (d_W) and Cavalli-Sforza and Edwards' distance (d_CE), and Nei's (1972) (d_N72), Nei et al.'s (1983) (d_N83), and Reynolds' (d_RE) dissimilarity coefficient based on a Procrustes analysis with a published data set of seven CIMMYT maize populations (Reif et al., 2003).