Figure 4
From: Constructing a meaningful evolutionary average at the phylogenetic center of mass
Insufficiency of the root as a reference for an imbalanced tree. (a) The phylogeny relates n species, with species 1, 2, 3, and n explicitly shown. Branches are drawn to scale, labelled with branch lengths in arbitrary units of evolutionary divergence. "Root" denotes the common ancestor of species 1 through n and is equally divergent from all species. Species 2 through n share a more recent common ancestor. (b) Unrooted version of the phylogeny in (a). (c) Two-dimensional projection of n-dimensional embedding of tree into coordinate space. Shaded grey semicircle is projection of region in which new species are being added.