Fig. 3
From: Finding high posterior density phylogenies by systematically extending a directed acyclic graph
Applying an NNI to a sDAG at subsplits t and s, then combining the pre-NNI sDAG with the post-NNI sDAG into a single sDAG. Here \(t'\) and \(s'\) are the new nodes, and the red dashed edges are the new edges. Triangles are substructures in the sDAG, and X, Y, and Z are clades