Dust production rate as a function of the obtained CO masses. The different colors of the symbols correspond to the luminosity groups defined earlier in Sect. 6.2. The number and letter designations of the CO-bearing debris disks are the same as in Fig. 7. The three objects that were not included in that figure, HD 129590, HD 146897, and HD 181327, are labeled with the letters x, y, and z, respectively. For the HD 155853, we have only a lower limit for the f_d of the cold component (Appendix A.5), and hence also for the ${\dot{M}}_{{\mathrm{D}}_{min}}$.