(a) Effective clump radius as a function of clump mass. The symbols correspond to unconfirmed PS (pink squares), PS-C (blue stars), PRE (yellow circles), and unbound SL (purple triangles) clumps. Mean mass and radius are plotted with diamonds of the same color. The black line shows M ∝ R². (b) Angular size (left axis, purple crosses) and spatial size (right axis) of the clumps as a function of distance on a logarithmic scale. The distances are from GCCIV (Montillaud et al. 2015) (pink circles), the PGCC catalog (Planck Collaboration XXVIII 2016) (blue diamonds), and this paper (yellow stars). Random jitter of ≤10% has been added to distances to improve readability. The black line corresponds to the resolution of the SCUBA-2 instrument. (c) Clump α_vir (blue circles) plotted as a function of distance. Random jitter of ±3% of distance has been added for readability. The black dashed line is the limit of gravitational instability.