Modified wind momentum (D_mom) in units of M_⊙/yr km s as a function of stellar luminosity for analyzed LMC OB stars. The filled and hatched symbols are wind momenta determined from Hα or nitrogen emission lines and from UV P-Cygni profiles with individual error bars, while open triangles (up-side down) indicate upper limits. A power-law (solid line) fit to the observations yields a slope of 1.61. The theoretical WLR from Vink et al. (2000; dashed line) and an empirical WLR from Mokiem et al. (2007) for LMC stars are also plotted. Luminosity classes are distinguished by different symbols as given in the legend.