Multiplicity fraction MF as measured with GRAVITY for mass ranges < 3 M⊙, 3–7 M⊙, 7–16 M⊙, > 16 M⊙ (red circles). The values from Duchêne & Kraus (2013) for the whole mass range of ≲1 M⊙ to O stars and the values from Sana et al. (2014) for O stars are plotted for reference. For each mass range we use as uncertainty estimate.
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