Fig. 8.
Comparison of the astrometric quality criteria F2 (goodness of fit; see Table 1) from HIPPARCOS (van Leeuwen 2007) and RUWE from Gaia DR2. Values exceeding F2 > 3 (dashed line) and RUWE > 1.4 (solid line) indicate a poor astrometric fit of the HIPPARCOS and Gaia DR2 data, respectively. Magenta open hexagons and green open squares mark known binaries.
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