Location of the target stars in the modified wind momentum versus luminosity diagram. Also indicated are the theoretical predictions from Vink et al. (2001) and the empirical results from Mokiem et al. (2007). NGC 3109-4 is shifted by −0.01 dex in luminosity for clarity. 1σ error bars are indicated. The thick line represents a linear fit to our results, and shows that the wind strengths are comparable to the empirical LMC results.