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(a) Scree plot of singular values. Singular values (σj) were obtained from a SVD of 400 genes from each of 100 genomes. (b) Contribution of var(uj)between (between-genome variance) to overall variance. Overall variance is scaled to 1 in each dimension. The rest of the overall variance is due to var(uj)within (within-genome variance). In only two dimensions, j = 1 and 2, is var(uj)between the major source of variance.
