log(L_X/L_bol) × log(Ro) for stars in the sample of Vidotto et al. (2014). In the left panel, τ_c values, which enter in Ro calculations, were obtained from DL models with P_lock ∼ 8 days and T_disk = 3 Myr. In the right panel, τ_c values were obtained from AMC models. Solar-like stars are shown as , the Sun in its maximum and minimum levels of activity as , young suns as , hot-Jupiter hosts as , M dwarfs as , and T Tauri stars as .