Information content. Posterior 95% credibility interval width is plotted against posterior mean divergence time using the results from Multidivtime on TOptimal. Here R2 indicates the amount of information present in the data matrix and the regression coefficient is an estimate of the expected uncertainty that is independent of sequence length.
Brown et al. BMC Biology 2008 6:6 doi:10.1186/1741-7007-6-6