Fig. A.1
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TEFF_SPEC-LOGG_SPEC diagram of the selected BHB candidates obtained by different cuts, and the BHB sample of Barbosa et al. (2022) is used as a reference. The proportion of contaminants from high surface gravity (LOGG_SPEC>3.7) stars is 28% for only photometric cuts, 14% for only spectroscopic cuts, and 5% for combined photometric/spectroscopic cuts.
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