^aClassification of topologies and branches following that in Figure 1. FSGD indicates fish-specific genome duplication.

^bNumber of cases where the model A with foreground ω₂ = 1 is not significantly less likely than the model A with ω₂ > 1.

^cω₀, the purifying selection pressure, has the same value for foreground and background sites; only the proportion of sites under ω₀ varies.

^dCorresponding foreground sites are all ω₁ = ω₂ = 1.