Characteristics of the structures (clumps) defined by a thresholding at (see Sect. 3.1.1 in text). a) The size distribution. Error bars show the uncertainty. The dotted line shows the least-squares fit to the distribution, with the slope −0.9 ± 0.2. b) The same for the mass distribution. The linear fit results in the slope −0.4    ±    0.2. c) The mass-radius relation. Overplotted are slopes indicating M ∝ R³ and M ∝ R² (dotted lines), the linear fit to the data points which has a slope 2.7    ±    0.2 (dashed line), and the resolution limit R = 0.1 pc of the data (solid line). d) The distribution of mean volume densities.