Field stars in GES iDR4 catalogue with UVES observations. The left panel displays the Li content (LTE) against log (g), and the rightpanel shows log(g), as an indicator of the evolutionary phase, against effective temperature (T_eff). We consider stars with log(g) ≥ 3.7 dex, namely those falling in the shaded areas, as main sequence stars. The median values of the parameter error are displayed in the left upper corner of each panel.