Mass spectra for various Mach numbers and PDF. Top: mass spectrum of self-gravitating structures. Bottom: time-weigthed cumulative mass spectrum of self-gravitating structures. Both quantities are plotted for a series of Mach numbers from ℳ = 5 (blue) to ℳ = 100 (orange), and for η_d = 0.2 (solid lines) and η_d = 0.5 (dotted lines). The models in the left column make use of the log-normal PDF while the ones in the right column use the Castaing-Hopkins PDF. For all curves, the compressibility parameter b is 0.67, the injection scale, L_i, is assumed to be 200 pc and the mean density n₀ is 1.5 cm⁻³.