Figure 4.

Posterior mean number of substitutions as a function of the tree length Λ for the tree topology T₄. The posterior means for patterns 0000 (dashed line), 0011 (grey solid line) and 0110 (black solid line) are shown. (a) The posterior means on the tree with relative branch lengths $p_{\text{A}}=p_{\text{B}}=p_{\text{C}}=p_{\text{D}}=0.2$ and $p_{\text{AB}}=p_{\text{CD}}=0.1$. (b) The result for relative branch lengths $p_{\text{A}}=p_{\text{D}}=0.47$, $p_{\text{B}}=p_{\text{C}}=0.02$ and $p_{\text{AB}}=p_{\text{CD}}=0.01$.