Cumulative distribution plots of the dust disk masses. Top: masses of the Perseus Class 0 and I disks measured with ALMA at 1 mm compared with the Lupus Class II disks measured with ALMA (Ansdell et al. 2016). The opacity value of κ_{1.3 mm} = 2.3  cm² g⁻¹ is used to calculate the masses. The ALMA sample consist of 77 sources (38 Class 0 and 39 Class I) and the Lupus sample consist of 69 sources. Bottom: masses of the Perseus Class 0 and I disks measured with VLA at 9 mm (red and blue, respectively), compared with the Lupus Class II disks measured with ALMA (Ansdell et al. 2016). The opacity value of κ_{9 mm} =0.28  cm² g⁻¹ is used to calculate the VLA masses. The VLA sample consist of 100 sources (49 Class 0 and 51 Class I). Medians are indicated in the labels.