Percentage of H₂O in the mixtures with the different mixing components NH₃ (m/z 17), CH₄ (m/z 16), and CO₂ (m/z 44) for mixtures of ratio 20:1 (shades of red) and of ratio 5:1 (shades of blue). The ratios are determined from the ratio of the mixtures in the gas phase (squares), from the counts per second recorded by the RGA during deposition (circles) and from the band strengths in the FT-RAIR spectra (triangles). The dashed horizontal lines correspond to the desired 20:1 and 5:1 ratios.