Cumulative mass distribution (given by Eq. (11)) against fragment mass of the power-law populations resulting from the simulations with 17.5 (open triangles), 25.0 (closed triangles), and 27.5   ms^-1 (open squares). Both axes are normalised by m_pw. For high fragment masses, the gradient of the slope decreases with increasing velocity. For low masses, it remains unclear whether the deviation from the power-law is a physical or numerical artefact.