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The algae phylogeny explored in the example. Branches are color-coded by the posterior means of the branch-specific evolutionary rates. Horizontal bars represent 
posterior credible intervals for the internal node times. Letters a)–f) indicate where fossil record informed calibration normal priors are placed on the tMRCAs of clade a: Harveylithon, clade b: Porolithon, clade c: Lithophyllum pustulatum, clade d: Hydrolithoideae, clade e: Hapalidiales, and clade f: Sporolithales.
