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Fig. 3

Thick lines: correlation function of the projections of the photocentre positions extracted from the 3D model. Thin lines: correlation function of simulated photocentre positions generated with an exponentially decreasing correlation function (see Eq. (3)) with σP ≃ 0.09 AU and τ ≃ 2 − 4 × 106 s sampled every 23 days.
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