Absolute G−band magnitudes vs. log α₀. The markers are color coded as a function of log T_eff. The designation for the α Cygni variables and for stars susceptible to TESS contamination follows that in Fig. 6. We show the linear fit to BSGs with M_G fainter than –6.4 mag (thick solid line). The fit (+offset) to the respective parameters of BSGs in the LMC is displayed (dashed line; Bowman et al. 2019a).