Evolutionary versus spectroscopic masses (in M_⊙) of LMC (blue) and SMC (green) OB stars, in which main sequence stars are circles/triangles and post-main sequence stars are squares/diamonds. Stars with unreliable surface gravities or uncertain stellar parameters are indicated with open symbols. The solid black line is a 1:1 relation, while dashed (dotted) black lines are fits to LMC (SMC) stars up to 60 M_⊙.