Ratios of integrated intensities of molecules (SO, SiO, SiS, CS, and HCN) and infrared emission (12, 25, and 60 μm) in binary post-AGB stars. Upper limits are represented with empty circles. Blue and red lines represent the averaged values for O- and C-rich AGB CSEs. Sources are ordered by increasing outflow dominance and enumerated as follows: 1 – AC Her, 2 – Red Rectangle, 3 – 89 Her, 4 – HD 52961, 5 – IRAS 19157–0257, 6 – IRAS 18123+0511, 7 – IRAS 19125+0343, 8 – AI CMi, 9 – IRAS 20056+1834, and 10 – R Sct. Sources 1 and 2 are disk-dominated binary post-AGB stars, sources 6–10 are outflow-dominated, while sources 3 and 4, and 5 are intermediate cases. We note the broad range (on a logarithmic scale) of intensity ratios. We always find uncertainties lower than ~20% in these ratios, which are basically dominated by that of the integrated intensity of the molecules other than CO (see main text for details).