Magnetic field lines in the analytical CH model given by Eq. (21) (β₀ = 0). In this example, the half-width of the CH at z = 0 is x₀ = h. Magnetic field lines coincide with isocontours of the flux function A₀. The geometry of the magnetic field would be affected by boundaries at a finite distance from the source, but the method implemented in this work prevents these effects through the Green functions.