Evolution of the f_Δν ratio for the 32 parameter combinations considered. Top panel: trend of f_Δν vs. log g. The solid violet line indicates the reference model with M = 1.0 M_⊙, Z = 0.00477, based on the Sharma et al. (2016) data set. Different colours represent models with varying (orange) and fixed (green) opacity κ in the atmosphere, the primary source of systematic uncertainty in f_Δν. Line styles differentiate models calculated with (dashed) and without (solid) microscopic diffusion, which is the second most significant contributor to systematic uncertainty in f_Δν. Bottom panel: same as the top panel, but shown as a function of the q parameter.