Comparison of logQ values derived from the IACOB-GBAT analysis leaving β as a free parameter (x-axis), and fixing this parameter to one (y-axis). The figure includes results for all stars in the sample. Different colors and symbols indicate different luminosity classes. Open symbols indicate stars for which we have detected clear or likely signatures of spectroscopic binarity. The dashed line is the 1:1 relation, and we show the mean and standard deviation of differences.