Comparison of the molecular gas emission toward the AGN probed by the HCO⁺(4–3) (yellow-filled histograms) and CO(3–2) (gray-filled histograms) lines in two subsets of GATOS galaxies. Upper panels: comparison for the galaxies shown in Fig. 14 where strong (> 15σ) and/or spatially resolved emission is detected in HCO⁺(4–3): NGC 5506, NGC 5643, and NGC 6300. The spectra stacked for these sources is shown under the label stacking-I. Lower panels: compare the AGN spectra obtained in NGC 7314, NGC 7465, and NGC 7582. For these galaxies, either the detection of HCO⁺ or the lower limit on the CO/HCO⁺ ratio are statistically significant. The spectra stacked for these sources is shown under the label stacking-II.