Sample solutions of Eq. (7) for NGC 7331 at R = 8 kpc. Top panel: density solutions for a three-component galactic disc having a single-component molecular disc. Bottom panel: same for a four-component disc. In this case, the molecular disc is assumed to be a two-component system with a thin and a thick disc. The red dotted and the solid blue lines in both of the panels represent the volume densities of the stellar and atomic discs, respectively. The black dashed line in the top panel represents the volume density of the thin disc molecular gas in a three-component disc. Bottom panel: the thin dashed-dotted black and dashed magenta lines represent the volume density of molecular gas in the thin and thick discs, respectively, for an assumed thick disc gas fraction of 0.5. Whereas, the thick dashed-dotted black and the dashed magenta lines represent the same for an assumed thick disc molecular gas fraction of 0.7. See the text for more details.
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