Average line mass of all filaments ⟨M_lin,3D⟩ (top) andnumber of fragments (bottom) found in models M3 (left), M4 (middle), and M8 (right) as functions of time. The coloured areas illustrate the 1σ range. The red area indicates the critical value of M_lin,3D for an isothermal cylinder with temperatures between 10–15 K. The grey dashed lines mark the times when the first fragments in each simulation form.