Top panel: vertical column density profiles of the edge-on molecular discs in NGC 7331 (single-component and two-component) at a radius of 4 kpc for different imaging resolutions. The spatial resolutions are quoted in the top left corners of each sub-panel. Bottom panel: dependence of the normalised vertical column density profile on inclination. In both of the panels, the solid red and blue dashed lines represent the molecular column density profiles for a single-component and two-component molecular disc, respectively. See the text for more details.
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