Fig. 2From: Improved mitochondrial amino acid substitution models for metazoan evolutionary studiesThe ratio of exchangeability rates between mtZoa and mtMet/mtVer/mtInv models. The size of one circle represents the exchangeability rate between mtZoa and other models. The solid (unfilled) circles represent exchangeability rates where mtZoa is smaller (bigger) than the three models. For visualization, the large ratios are trimmed at 10 and marked with ‘*’Back to article page