Position of the AMBRE and GALAH sample stars (top and bottom respectively) in the different metallicity bins, with the Li abundance colour-coded (stars with A(Li) lower than 2.2 are all in grey). In each panel, the seven stars with the highest lithium abundances of the corresponding metallicity bin are shown with star symbols (when MS) or diamonds (when PMS). We indicate otherstars that were found to be PMS (squares). Evolution tracks from Lagarde et al. (2017) are shown (PMS and MS) for [Fe/H] values, covering the respective observational ranges.