(V,V−I) color−magnitude diagram of all optical stars in the NGC 6231 ACIS FOV. Crosses are X-ray sources, with color codes as in Fig. 3, while dots are X-ray undetected stars. The solid green line is the Siess et al. (2000) ZAMS using the Kenyon & Hartmann (1995; KH95) color transformation, at the cluster distance and reddening. The black polygons are used to define stellar groups, as labeled. The cluster extinction vector is also shown.
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