Fig. 5

Difference between empirical mass-loss rates and those predicted by the mass-loss recipe proposed by Vink et al. (2001). The sample consists of 14 early O-dwarfs with spectral types earlier than O4V (see text for the references and discussion) in the Galaxy (Z = 1 Z⊙), the LMC (Z = 0.5 Z⊙), the SMC (Z = 0.2 Z⊙), and IC 1613 (Z = 0.14 Z⊙).
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