Fig. 3From: Exact median-tree inference for unrooted reconciliation costsTypes of unrooted trees. Four possible types of unrooted gene trees G (under the assumption that |L(G)|≥3 and L(S)≥3). Red color (in the center) denotes G∗ (plateau) while grey subtrees denote the rooted forest \(\check {G}\). Border nodes are marked by black circles and decorated with its possible star types (when applicable). See also Fig. 2Back to article page