Modified wind momentum (D_mom) in units of M_⊙ yr^-1 km s as a function of the stellar luminosity for the analyzed LMC Of stars. The alternative values for the two supergiants adapting strong clumping (see Sect. 3.2.1) are indicated in open circles. The data are fitted by a power law (solid line). The theoretical WLR from Vink et al. (2000, dashed line) and empirical WLR from Mokiem et al. (2007) for LMC stars are also plotted. Luminosity classes are distinguished by different symbols. Individual error bars are given in the plot.