Gravity index γ and EW(Li) as a function of the stellar effective temperature (upper and lower panel, respectively). The index γ and the EW(Li) measured from the GES spectra are indicated with circles: the empty green circles are the non-members, the filled blue circles are the cluster members, and the red dots represent the members already known from previous studies. Upper limits are indicated by red downward arrows. Median error bars are shown on the left for both panels. The black crosses in the bottom panel are the EW(Li) measured for stars in the 30−50 Myr open cluster IC 2602 by Randich et al. (1997, 2001). In both panels, the dashed red lines indicate the threshold used to separate members and non-members. In the bottom panel, a few stars that are above the dashed red line are reported as non-members because they have been excluded according to the criterion based on the gravity index, and other stars that are below this line are classified as members because they are strong accretors, as discussed in Sect. 3.