Experimental (dotted) and simulated (solid) desorption traces of CO:N₂ mixtures from c-ASW (top panel) and from PCI (bottom panel). Blue and red arrows indicate the position of the highest temperature at which the most tightly bound molecules desorb, calculated from the energy values reported in Table 2. Vertical dashed lines represent the highest temperature desorption in pure ices experiments, calculated from the energy values reported in Table 1.