Time evolution of the surface abundances for the 1.5 M_⊙ model with g_rad computed with OP (thick black line), SVP2020 (red line), and SVP2004 (blue line), expressed as the difference between the logarithm of the current ratio to H in number fractions and the corresponding initial value. Solid lines represent the models with RMT mixing, and dashed lines the mass loss (‘wind’) models. The thin dotted line represents the initial abundance. In each panel, the grey bar shows the typical abundance uncertainties (see the main text). The horizontal green bar represents the MS phase.