Fig. 1.
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Illustration of the orbit average in physical space. The test star (in black, part of whose orbit is shown in red) is averaged over all its available positions in its orbital plane, within the radial range of the orbit (r ∈ [rp, ra]) and its angular range (φ ∈ [0, 2π]), weighted by the surface density Ωr/(2π2|vr|). Here, the frame is that of the right panel of Fig. A.2.
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