Accretion flux of disk material onto the host star for small particles (α = 1 × 10⁻³, left panel) and for large particles (α = 1 × 10⁻⁴, right panel) as a function of time. On the ordinate, the accretion rate with respect to the hydrogen accretion rate, Ṁ_i/M_H, for various elements i is shown, indicated by different colors. The accretion rate is shown normed to the mass fraction with respect to hydrogen of the element as defined by the initial condition. Therefore, if the ordinate value is larger than 1, the material that is accreted results in a growth of the abundance of element i in the convective zone up to the magnitude of the enrichment. The accretion rate is directly related to the surface density evolution (see Fig. 3).