Binding energy distributions of pure CO and N₂ (dashed lines) and of a 0.65 ML-CO–0.35 ML-N₂ mixture (solid lines) on c-ASW (top panel) and of a 0.91 ML-CO–0.09 ML-N₂ mixture on PCI (bottom panel), obtained using the classical inversion method. The black solid line is the sum of CO (solid blue line) and N₂ (red solid line) energy distributions calculated during the CO:N₂ mixture experiment.