Infrared color‐magnitude diagram for all sources in the VLT field. X‐ray sources are indicated by crosses, and non‐X‐ray sources are indicated by open circles. The 0.5 Myr (squares), 1.0 Myr (triangles), and ZAMS (filled circles) isochrones for 2.5–0.08 M_⊙ are plotted (Siess et al. 2000). Visual extinction of 30 mag for a 2.5 M_⊙ star is indicated by the dashed line. The dot‐dashed lines indicate extinction of 30 mag for 0.08 M_⊙ stars at ages of 0.5 (upper) and 1.0 Myr (lower).