Empirical mass-loss rates versus luminosity for the analyzed Galactic WC stars. The subtypes are distinguished by different symbols as explained in the inlet. The numbers beside the symbols identify each star by its number in the WR catalog (van der Hucht 2001). The red-dashed red line gives the least square fit to these results. The full, shaded lines represent the relations proposed by Nugis & Lamers (2000) for WC stars with 40% and 60% carbon, respectively.