Comparison between spatial distributions of X-ray sources, YSOs and other young stars in each X-ray FOV. The background grayscale image is a 2D histogram of the combined optical-NIR object density, showing clearly high-obscuration regions. Solid black circles and squares are XMM and ACIS FOVs, respectively. Symbols as in Figs. 9 and 10, except that here X-ray sources (crosses) are color-coded according to their J−H color (with the color scale show in the top left panel). X-ray sources without a NIR counterpart are shown in red. Black plus signs indicate positions of all RGS11 YSOs, regardless of their identification with X-ray or other cataloged objects. Small empty circles are young stars from Armond et al. (2011; black) and Welin (1973; violet). Yellow circles are 2MASS star clusters from Cambrésy et al. (2002). The black dashed rectangular regions are defined here as places with a local overdensity of X-ray sources, not matched by an overdensity of YSOs. The three bigger star symbols indicate respectively the O5 star 2MASS J20555125+4352246 (cyan), and FUOrs HBC722 (green) and V1057 Cyg (orange).