Stars with enriched Li (A_Li > 2.2 dex). Upper panel:error-weighted mean A_Li values of the six stars with the highest Li abundance in each [Fe/H] bin; the standard deviation of their A_Li values is considered as the uncertainty. Blue filled dots represent the thin disc and the orange stars indicate the thick disc. The symbols are displayed when there are more than six Li-enriched thin/thick stars in the bin. Middle panel: fractions of Li-enriched stars (f_A(Li)>2.2) in each [Fe/H] interval for thin disc stars (blue-shades histogram) and thick disc stars (orange-shaded histogram). Lower panel: error-weighted mean T_eff values of the six stars with the highest Li abundance in each [Fe/H] bin; the standard deviation of their T_eff values is considered as the uncertainty. Symbols are the same as in the upper panel.