Map of the perturbing potential in the plane of the galaxy. The colors represent the values of Φ1(R,ϕ) in arbitrary units. The picture on the left is the potential with σ = 2.5 kpc and on the right σ = 4.7 kpc. For i = 14° we have on the left σ ⊥ = 0.6 kpc and on the right σ ⊥ = 1.1 kpc.
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