Modified wind momentum (D_mom) vs. luminosity (log L_⋆) for the O-type stars analyzed in N11 B. An increasing trend is observed. Two exemplary WLRs are displayed: the one predicted by Vink et al. (2000) (dashed line) and the empirical relation obtained for LMC OB stars by Mokiem et al. (2007b) (dotted line). Notations and color-coding are the same as in Fig. 9. Typical uncertainties are indicated. A linear regression of our values is shown by a red continuous line.