, plots of the simulated clusters in this work, described in Fig. 1. Upper panel: original normalisation in CW04, lower plot: convex hull, proposed by Schmeja & Klessen (2006). Coloured circles, squares, and triangles represent fractal, radial, and Plummer distributions. Black stars represent the real clusters, each of them tagged appropriately. The black line represents the limit Q = 0.8 traditionally separating structured from concentrated clusters.