Fig. 47.
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HRD of sources with low astrometric mass functions (< 0.001 ℳ⊙; green dots); the grey background is the DR3 low-extinction HRD. A very large fraction are not stars with low-mass companions, but rather binaries with a mass ratio similar to their flux ratio. The two blue sources are HD 12800 and HD 3221, described in Sect. 8.7 while the four WDs are discussed in Sect. 8.8.
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