Figure 4

Divergence age estimates. Ultrametric tree with divergence age estimates resulting from the combined posterior distribution of 45,002 samples from four replicates of the BEAST analysis based on combined 'Brown region' and cytb sequence data from 18 Papio individuals. The mean age estimate for each node is given in mya, with the respective 95% credibility intervals indicated by the grey bars. Nodes of interest are arbitrarily numbered (N1-N19). C3 refers to one of the three nodes used for calibration (C1 and C2 not shown). A geological time scale is given on the left. Full details of age estimates are presented in Table 1.