Density distribution plot of the core mass normalized to the thermal Jeans mass, M_J, presented as function of the clump L/M (right panel) and surface density, Σ_c (left panel). The contours identify the different areas for which, going from the external to the internal, a fraction of 10%, 25%, 50%, 75%, 95% of the entire distribution lies outside. The horizontal lines are reference values of the ratios: unity (dashed), 0.1 (dot-dashed), and 5 (dotted).