Maximum variation in [Fe/H] during the evolution (up to the tip of RGB) according to mass. The colours and symbols correspond to the values of [Fe/H]_i and ΔY/ΔZ. The maximum variation was determined for ages less that 13.5 Gyr for the models that evolve on longer timescales (M ≲ 0.95). Top panel: includes atomic diffusion without radiative accelerations, the middle panel shows models that include radiative acceleration, and the bottom panel shows D_T, Fe models.