Top panel: comparison of the vertical molecular density solutions with and without dark matter halo. The thick lines represent the density solutions for NGC 3521, and the thin lines represent the same for NGC 7331. Bottom panel: effect of the dark matter halo on the midplane pressure. The thick and thin lines represent the same as the above panel. The solid red line represents the calculated midplane pressure, including the gravity of the dark matter halo, whereas, the blue dashed line represents the same by excluding the dark matter halo. The black dashed-dotted lines represent the calculated midplane pressure using the prescription of Gallagher et al. (2018). See the text for more details.