Power (%) to detect selection with alternative models.

ρ, non-synonymous to synonymous rate ratio associated with mutations away from or towards wild type amino acid; ω, non-synonymous to synonymous rate ratio for mutations not involving wild type; T, toggling model where ρ is unconstrained in alternate; T(u), toggling model in which both ρ and ω are unconstrained; D, diversifying selection model.