Gaia CMD of detected stellar X-ray sources, η Cha members. Identified core and extended region stars are highlighted. The color bar represents objects in the 50–200 pc distance range, nearby stars are shown as red circles, and more distant stars as gray dots. η Cha members and core region members are highlighted. Isochrones are from PARSEC with log Age 7.0, 7.4, 8.0, and 9.0 (dashed line) and MS stars are taken from Mamajek (solid line).