Results of 2D Plummer function fits. The circles correspond to the parameters p that are plotted against the geometrical mean of the flat radii R₁ and R₂, which correspond to the clump major axis and minor axis directions. The solid lines are drawn from the plotted circles to the parameter combination that is obtained when clumps are selected at a 15% higher-column-density threshold. The solid and dashed vertical lines correspond to 40′′ at 100 pc and 500 pc distances, respectively. The right panel shows the distribution of p values (0 ≤ p ≤ 5 only) corresponding to the red symbols of the first frame.