FIGURE 6.

Changing the tree topology by sliding a subtree through an internal node. a) The unrooted tree from Figure 5b is shown for λ = 0, at which point a multifurcation is present. Further sliding of the Ateles/Galago subtree either toward Homo (upward as in b) or toward Pongo (downward as in c), alters the topology of the tree. Sliding the subtree toward Macaca (left as in d) restores the topology of Figure 5. The branch leading to Macaca is shaded gray in panel (a) for consistency with Figure 5.