Mass spectra of the extracted cores at time 10.04 Myr in simulation Z18. Top panel: no selection applied. Second panel: only subcritical cores, that is, those with μ < 1 are displayed. Third panel supercritical cores (μ > 1, solid line) and cores with μ > 0.3 (red dashed line). Bottom panel supercritical cores with central densities smaller than 10⁵ cm⁻³ and 10⁶ cm⁻³ (respectively black and blue solid curves).