Figure 6.

Computation of r(X, Y) as the ratio of the approximation of the distances between the roots of subtree spanned by X and subtree spanned by Y, <a onClick="popup('http://www.biomedcentral.com/1471-2148/8/208/mathml/M4','MathML',630,470);return false;" target="_blank" href="http://www.biomedcentral.com/1471-2148/8/208/mathml/M4">View MathML</a>, the average distance dave(X, Y) of the sequences in the two subgroups.

Przytycka et al. BMC Evolutionary Biology 2008 8:208   doi:10.1186/1471-2148-8-208
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