Lithium abundance predicted by our models as a function of time for different masses. Upper panel: for a MS star with M = 1 M_⊙ (solid line), stars of M = 1.15 M_⊙ (dot-dashed) and 1.28 M_⊙ (dotted) currently around the turn-off, and a more massive star of 1.33 M_⊙ (dashed line) that is already a giant. Lower panel: same plot, but after a  − 0.45 dex shift was applied (as in Fig. 2).