Density PDF for NF (top left), PSJo (top right), HIIRo (bottom left), and PSJ-HIIR (bottom right) runs for four snapshots (solid lines). The dotted lines visible in the top right and bottom left represent two snapshots of run NF, while the ones in the bottom right panel are from run HIIRo. The total accreted mass is indicated as it is more representative when comparing the runs.