Left: Diagram showing the evolutionary mass M_evo of stars with spectral types B5 and earlier plotted against absolute magnitude M_Gbp, for both stars with (OBe) and without (MS) emission features in their spectra. The spectral type catalog is from Bonanos et al. (2010) and the evolutionary masses were determined by Schootemeijer et al. (2021). Right: Histograms that show the evolutionary mass distributions of the sources that are displayed in the left panel, in different M_Gbp intervals. The average evolutionary masses of sources in these magnitude intervals (i.e., OBe and MS) are written in each panel.