HR diagram of the CTTSs in our sample where no emission was detected (black dots), those with detected [OI]λ6300 emission but no HVC (red diamonds), and those with a HVC (blue squares). Solid and dotted black lines represent mass tracks and isochrones, respectively, of Siess et al. (2000). Solid green lines separate the regions in which a star is expected to be fully convective (right) and possess a radiative core of M_core > 0.4 M_* (left), according to Gregory et al. (2012).