Table 2. The inferred Archaea-Bacteria (AB) branch length from a concatenation of the top 27 markers using a simple model compared to models that account for site compositional heterogeneity.

Models that account for across-site compositional heterogeneity fit the data better (as assessed by lower Bayesian information criterion [BIC] scores) and infer a longer AB branch length.

Substitution model	BIC (∆BIC)	AB branch length
LG + G4 + F	5935950.053	1.4491
LG + C20 + G4 + F	(152046.1)	2.1394
LG + C40 + G4 + F	(179126.7)	2.4697
LG + C60 + G4 + F	(189063.8)	2.5178