Fig. 5.
Distribution of spectral types and observed close binary fraction for B and Be stars. Top panel: distribution of spectral types for all MS stars (dim gray) and stars for which RVs were measured (dark gray). Bottom panel: observed spectroscopic binary fraction as a function of spectral type. The red curves indicate the binary fraction inferred from the RV measurements, and the orange curve combines the RV measurements with the SB2s found by visual inspection.
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