Panel a): the observed CMD of the bulge BUL-SC29 field . The red solid line is the 1 Gyr isochrone for a solar metallicity population (Pietrinferni et al. 2006). Panel b): the observed CMD of the disk control field ~30° away from the Galactic center. The region within the box has been used to normalize the number of disk stars seen through the bulge line of sight. Panel c): the CMD of the bulge BUL-SC29 field as statistically decontaminated from the disk population. Panel d): the CMD of the stars that were statistically subtracted from the CMD in panel a) in order to obtain the decontaminated CMD shown in panel c).
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