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Fig. 4.
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CMD of the RGB candidate sample (2D histogram), overlaid on all stars within 100 pc from Gaia DR3 (grey points). Highlighted are the confirmed BH binaries Gaia BH 2 and BH 3, and the candidate LAMOST BH. Neutron star binaries (triangles) and Gaia BH 1 are shown for reference, but lie outside our RGB selection.
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