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Fig. A.1

image

Toy model of an infinitesimally small part of the stream lines a particle will follow during its orbit around the central object. The median distance between the stream lines is dr, δr is the radial perturbation, δϕ is the azimuthal shift between the stream lines caused by the pitch angle of the spiral (d ϕspir ∕dr), and θ is the angle of the stream line from a circular orbit.

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