Li abundances of open clusters and field stars from the Gaia-ESO catalogue (Romano et al. 2021) as a function of metallicity (left panel) and stellar age (right panel). The models shown in Fig. 7 are also adopted in this plot. The grey error bars indicate the mean uncertainties. The shaded area indicates the defined envelope computed from the field stars. The black vertical line in the right panel is for an age of 4.6 Gyr.