Effective temperature vs. surface gravity diagram, with the stars color-coded according to their Li abundance (left). The approximate location of the Li-dip region according to Gao et al. (2020) is highlighted in pink. The red points represent the warm stars, T_eff > 6800 and S/N > 75 pix⁻¹. The [Fe/H] vs. Li abundance trend for the warm stars shown as red points. Gray dots represent the other stars shown in the left plot (right).