Clump masses as a function of the clump effective radius. The sample consists of 10 arcmin² clumps. The circles denote values derived from the observed column density maps. The crosses are the values from 3D models, smaller symbols corresponding to progressively higher volume density thresholds. The dotted lines correspond to the values α = 1 and α = 2 of the virial parameter (3D clumps), with the assumptions listed in the text. The red, green, and blue symbols show the actual valueswith α < 1, 1 < α < 2, and α > 2, respectively.The grey band corresponds to an empirical relation of CO clumps (Elmegreen & Falgarone 1996; Pattle et al. 2015).