Comparison between the CMDs of the bulge fields observed in this work (left and right panels). The magnitude difference between the HB-RC and MS-TO of the BUL-SC29 field (dashed horizontal lines) is compared with the same quantity for the BUL-SC9 field. The CMD of the BUL-SC9 field has been shifted in magnitude and color to match the location of BUL-SC29 HB-RC. In both these panels the solid red line is the empirical ridge line of the CMD of the BUL-SC29 field. The central panel shows the J − (J − H) CMD of the bulge globular cluster NGC 6528, showing that the luminosity difference between the HB–RC and the MS–TO is virtually identical to that of the two bulge fields.
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