Radiative accelerations for a subset of the included species in models with turbulence anchored at a fixed ΔM₀ = 10^-7.5    M_⊙, after approximately 25 Myr on the HB. Dotted lines represent gravity. Left panel: in models with T_eff ~ 31   000 K and metallicities of Z₀ = 0.0001, 0.001, 0.004 and 0.02, (masses from 0.51 to 0.47    M_⊙) from top to bottom. Right panel: with Z₀ = 0.001 and various masses corresponding, from bottom to top, to T_effs of 10 700, 15 000, 20 000, 25 000, and 30 400 K.