Left-hand panel: radial distribution of the surface mass density of the Galactic disk model; the “observation-based” disk model (blue curve) and the resultant from the sum of all the 3 MN-disk combinations fitted to each disk subcomponent (red curve). Right-hand panel: vertical profile of the volume density of the Galactic disk model as a function of the height z from the mid-plane and at three different arbitrary radii: R = 2 kpc (solid lines); R = 8 kpc (R₀) (dashed lines); and R = 15 kpc (dotted lines). The blue curves are also related to the “observation-based” disk model and the red curves to the total 3 MN-disk combinations.