Net Hα equivalent width versus T_eff of the γ Vel (left panel) and Cha I (right panel) members observed with GIRAFFE and UVES. The symbol size scales with the vsini. Filled symbols denote the accretor candidates (10%W_Hα> 270 km s^-1), while the targets with a significant amount of veiling (r ≥ 0.25) are enclosed in open squares. The two arrows represent the targets with EW_Hα out of the range.