Fig. 4

Illustration of two sets of trees which give the same unweighted Unifrac distances between a pair of samples. Yellow branches are those with descendants in both communities, and blue or green branches are unique to the square or the diamond communities, respectively. If all the branches have the same length, both the tree on the left and the three-tree forest on the right lead to unweighted Unifrac distances of.5 between the square and diamond communities