Mass-loss rate of the WN stars in the SMC vs. the Eddington factor. The meaning of the colored symbols is the same as in Fig. 7. The open symbols refer to the OB-type stars studied by Mokiem et al. (2007). The gray filled symbols depict the position of the SMC WN stars (with X_H< 0.5) when the mass is calculated based on a mass-luminosity relation for hydrogen free stars. The dashed line is a linear fit to the OB-type stars and the WN stars (colored symbols).