EW_Li versus RV for stars in the Cha II FoV (see Table 1). Open circles refer to most probable single stars, filled circles are multiple components, and asterisks refer to field stars. We excluded stars whose binarity was detected from RV variation at different phases (namely, Sz51 and Hn 24; see Table 5). In the case of Sz54, observed with both FLAMES configurations, we considered only the UVES RV values. Vertical lines represent the ⟨V_rad⟩ ± 3σ values, where σ = 2.0 km s^-1 (see Sect. 3.1).