The vertical gravity gz of axisymmetric doubly exponential MW discs and radial scale-lengths H = 1.4,1.8,2.2,2.6,3.0,3.4, and 3.8 kpc; the blue line is gz for a uniform infinite plane with the default local surface density Σ0 ≡ Σ(R0;A ≡ 0); the red lines are fits to gz(z< 3 kpc) assuming an additional effective infinite uniform disc component (see text).
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