Total mass above various density thresholds in the simulations as a function of time. Solid lines correspond to a density threshold of 10³   cm^-3, dotted lines to 10⁵   cm^-3, dashed to 10⁷   cm^-3, dot-dashed to 10⁹   cm^-3, triple dot-dashed to 10¹¹   cm^-3 and long-dashed to 10¹³   cm^-3. The left column shows the high resolution simulations, while the right column shows the lower resolution. Top panels display the μ = 2 case, middle panels the μ = 5 ones, while bottom panels display the μ = 120 case.