Fig. 3.

Representative labeled rankings of all six-taxon unlabeled species tree topologies, except the caterpillar and pseudocaterpillar. (A–D) Bold lines indicate a displayed five-taxon tree topology given in figure 2A. We set some lengths of the speciation intervals to be equal to aid in visualization and computation. Two values L and S, measured in coalescent units, are used as interval lengths. All values of L are equal to each other and all values of S are equal to each other. The figures are not drawn to scale.