NIR J vs. J − H color–magnitude diagram using the same sample and symbols as in Figure  10. The purple solid line and dashed line are the 2 Myr isochrone and the 1 Myr isochrone for PMS stars from Siess et al. (2000), respectively. Both isochrones are shown here because of the uncertainty in stellar ages. The dash-dotted line marks the location of Zero Age Main Sequence (ZAMS) stars. The blue dashed lines represent the standard reddening vector with asterisks marking every A _V = 5 mag and the corresponding stellar masses are marked.