Stellar convective envelope elemental abundances as a function of time relative to the initial abundances, [X/H] – [X/H]₀. Four different simulations are shown, varying α and u_frag to consider different maximum grain sizes in combination with different gas accretion speeds. Differently colored solid lines represent the abundances of the elements carbon (yellow), oxygen (red), iron (green), and nitrogen (blue), while the black dashed line shows the convective zone mass evolution as , as in Fig. 2, corresponding to M_⋆ = 1 M_⊙ and [Fe/H] = 0. Solid lines indicate results for M₀ = 0.1, while dashed lines show a comparison to simulations with M₀ = 0.05.