υmacro as a function of log(ℒ / ℒ⊙), with , for the sub-set of SMC B-type stars from Dufton et al. (2006; blue circles) and Galactic B-type stars from Simón-Díaz (2015; red circles) in the effective temperature range Teff≈17−23 kK, superposed on the computed (red continuous line for the MW, blue dashed for the SMC) as a function of log(ℒ / ℒ⊙) at Teff = 20 kK.
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