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Fig. 4

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Position of the center of the circular aperture (blue triangles) and AGPM (red circles) with respect to their median value, for sky frames only. Left: position for HD 34282. Middle: same, but for β Pictoris. Right: same, but for R CrA. The axis scales of the left, middle, and right panels are 1:8, 1:1, and 1:3, respectively. The colored crosses correspond to the uncertainty obtained on the fit.

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