Hertzsprung-Russell diagram for BPMG members in the sample. The blue solid line represents the 20 Myr isochrone, while the blue dashed one represents a 20 Myr isochrone with 2 times larger luminosity to include unresolved binary systems. The isochrones come from the models by Siess et al. (2000). Red filled circles are objects detected by PACS while black filled circles are objects not detected in PACS photometry.