Relationship between the ratio of the 2D (Eq. (9)) vs. 3D (Eq. (12)) aperture corrections SCO2D/SCO3D and the ratio of the molecular gas scale height of the disc to the beam size zCO/θ for the HRS galaxies of the sample. Black open circles are for galaxies with an inclination ≤80 deg, red symbols for edge-on systems (i > 80 deg). The black solid line gives the relation determined for model edge–on galaxies.
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