Fig. 2.
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Rotated ellipses after Kalnajs (1973). Top panel: a series of orbits in the reference frame of 
for which the orbits close. In the first, second and third column, we plot the orbits, the orbits coloured as a function of radial velocity (VR), and as a function of azimuthal velocity (Vϕ − Vc), respectively. Two bottom rows: the same but for increasingly rotated ellipses.
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