Fig. 4
From: Finding high posterior density phylogenies by systematically extending a directed acyclic graph
An example of choice maps. In a the green solid edges are the parent and sibling edges returned by the rootward choice map (schematized by dashed line) for the given orange edge. In b the green solid edges are the left and right child edges returned by leafward choice map for the given orange edge. The “best known tree” for the given orange edge begins with the five highlighted edges: the orange edge common to both (a) and (b), the two solid green edges from (a), and the two solid green edges from (b)