Figure 3
From: TPMS: a set of utilities for querying collections of gene trees
Example of distance score computing for a gene tree with two different rootings. The reference species tree is shown in (A), with the names of the taxonomic groups written on the nodes (Bacteria, γ-Proteobacteria and Enterobacteria). The rooting given in (B) gives a sum of distances D(T)=1+0+0=1, while the rooting given in (C) gives a sum of distances D(T)=1+1+0=2. The rooting in (C) is therefore preferred over the one in (B).