Lithium as a function of the chromospheric activity indicator log L_Hα/L_bol for detections only (top three panels). First panel: A(Li) for stars with 3000 < T_eff < 3700 K in Gamma Vel A (open black circles), Gamma Vel B (open blue squares) and 25 Ori (red stars). Second and third panels: lithium excess ΔA(Li) (see text) for stars with 3000 < T_eff < 6000 K in NGC 2451 B and NGC 2547 (second panel, open circles and squares, respectively), and NGC 2516 (third panel, open circles). The red symbols mark stars for which the models predict full lithium depletion. Bottom panel: ΔA(Li) for NGC 2516 members as a function of the Rossby number R_o from Fritzewski et al. (2020). The symbols are the same as in the third panel.