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Sensitivity analyses of the Bayesian dating method with means and 95% credibility intervals of the three eusocial lineages as inferred under the following a priori root node ages: a, 100±20 Myr BP; b, 100±20 Myr BP, including only the Baltic amber fossil calibration; c, 80±20 Myr BP; d, 65±20 Myr BP; and e, 65±40 Myr BP. Grey shaded bar, warming period.
