Fig. 3.
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Observed dereddened CMD for all the ∼1.3 × 106 sources in Baade’s window, passing the quality cuts on the Gaia EDR3 astrometry and BDBS photometry. The horizontal dashed line marks the cut at i0 = i0, max − 3σi = 16.1 which we employ at the end of Sect. 3 to remove the MSTO and compute the ratio of blue to red stars in the field.
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