CAMD of YSOs of some representative young clusters with membership probabilities >0.90 assigned by combining spectroscopic and Gaia EDR3 criteria (Jackson et al. 2022). Blue x symbols trace the empirical sequence by Pecaut & Mamajek (2013). Members of the clusters Gamma Velorum (18 Myr old) and NGC2451b (50 Myr old) are also shown. Black solid lines are the theoretical solar metallicity Pisa isochrones while the red solid line is the complete photometric limit adopted in this work including the low mass extrapolation. Dashed, dashed-dotted and dotted lines are the 10 Myr isochrones at different metallicities. Blue and green solid lines represent the limits described by the equations 2 and 3.