Upper row: radiative accelerations for five atomic species, after 232 Myr of evolution in a model with a mass loss rate of 10^-13   M_⊙/yr (red curves) and in a model with turbulence (blue curves). The dotted lines represent gravity. Lower row: corresponding mass fraction in the model with mass loss and in that with turbulence. The dashed lines are the original values, which correspond to an original metallicity of Z₀ = 0.01.