Fig. 1.
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Colour-magnitude diagram of observed red giant stars, based on Gaia DR3 (Gaia Collaboration 2023a). The sample includes RGB stars just below the red clump within 500 pc of the Sun. Blue triangles mark spectra from OES, red circles from AISAS. BD+20 5391 is highlighted in yellow. The grey background marks all Gaia DR3 objects with parallax_over_error > 100 within 500 pc of the Sun.
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