2MASS color − magnitude and color − color diagrams of the X-ray sources detected in the XMM-Newton image, plus η Cha. Filled circles are the known cluster members in the EPIC field of view. Those members detected in our observation are marked with a larger circle. Open circles are X-ray sources in our list of detections. Small dots are 2MASS sources in the field of view. ZAMS and 8 Myr isochrones are a combination of pre-main sequence models by Siess et al. (2000), for intermediate-mass stars and Baraffe et al. (1998), for low-mass stars. In the color-color diagram, we plot only the 8 Myr isochrone.