Fig. A.1.

Comparison of spectroscopic, Mspec, and evolutionary masses, Mevol, for stars in our sample for which surface gravity, luminosity and effective temperature are known; ΔM = Mevol − Mspec is the mass difference and σΔM is the 1σ uncertainty of ΔM. “O no-LC” refers to stars in our sample with an O-type spectral type but so far unknown luminosity class.
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