Comparison of the vertical column density profiles for a single-component and a two-component molecular disc in our sample galaxies (same as Fig. 11). First and third rows: vertical column density profiles for different spatial resolutions, whereas second and fourth column: same for different inclinations. Different sub-panels represent different spatial resolutions or inclinations, as quoted in the top left of each sub-panel. The vertical profiles were extracted at a radius of 4 kpc for all of the galaxies except NGC 2976 for which it was computed at 1.5 kpc (as its molecular disc does not extend to a radius of 4 kpc). The solid red lines represent the vertical profiles for single-component discs, whereas the blue dashed lines represent the same for two-component molecular discs.