Hubble Space Telescope CMD (Milone et al. 2018) overlaid with binarity information. B-type stars are marked in yellow, Be stars in green, BSGs in blue, and RSGs in red. Open small circles indicate that no RVs could be measured, filled circles are stars with no significant RV variability, diamonds indicate stars classified as binary systems based on their RVs, and triangles indicate SB2 candidates.