2CD of our sample of stars, compared to the 1 Myr old model provided by DM98 and computed in the 2MASS system (pink solid line). The observed colors do not strictly follow the theoretical model, indeed they occupy a region elongated along the CTTS locus provided by Meyer et al. (1997) (green dashed line). Circles and crosses represent stars with spectral types provided by Da Rio et al. (2012) and R07 respectively. Gray error bars represent stars with observed colors not compatible with the model at the 2σ level: they are rejected in our analysis.