Calculated mass uncertainties (cf. Eq. (8)) as functions of HD 1–0 flux. The left and right vertical axis are related via ΔM_factor = 10^ΔM_dex. The black line shows the result if the full set of models is used (cf. Table 2). The other three lines show results for weakly flared (purple), intermediately flared (orange) and strongly flared (light green) disks (see Table 5 for definitions for these subsets). The subsets are also shown in the top left panel, which shows a scaled version of Fig. 2.