Upper panel: EW_Li versus effective temperature. The upper envelope for the Pleiades, as adapted by Soderblom et al. (1993), is overplotted as a dotted line. Lower panel: lithium abundance versus effective temperature. The “lithium isochrones” by D’Antona & Mazzitelli (1997) in the 2–20 Myr range are overlaid with dashed lines. In both panels, empty symbols represent spectroscopic binaries, while mean error bars are overplotted on the lower right corner.