Left: Volume-weighted PDFs at t = 2 and 4 Myr of GMC evolution are shown. PDFs for the total gas (black), CE₂ (blue), CE₃ (green), CE₄ (red), and CE₅ (cyan) are plotted. Dashed lines represent the non-colliding case, while solid lines represent the colliding case. Power laws are fitted to each total gas PDF for n_H > 10⁴ cm⁻³. Right: Same as left, except for mass-weighted PDFs.