Surface density contours based on 10th neighbor distances for the Chandra RMC sources. The green contours are densities for all candidates. The blue lines are contours for unobscured sources ( medE ⩽ 2.0 keV), and the red lines are contours for obscured sources ( medE > 2.0 keV). All contours follow the levels of density for obscured sources, starting at 0.057 stars arcmin ⁻² with steps of 0.45 stars arcmin ⁻².