Average dust mass at different wavelengths and with different opacities. The average disk dust mass from our sample is calculated from 1.3-mm, 3-mm, 1-cm, and 2-cm fluxes, assuming optically thin emission, and with different sets of opacity (Beckwith et al. 1990; Zubko et al. 1996; D’Alessio et al. 2001; Birnstiel et al. 2018, with a_max = 1 mm). A slightly different number of targets contribute to the individual data points across wavelengths depending on the available photometry.