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Fig. 3

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Position of the center of the circular aperture (with respect to the camera) during the observation sequence for sky and science images (red and blue, respectively), for HD 34282 (left), β Pictoris (middle), and R CrA (right); the axis scales are 1:5, 1:1, and 1:3, respectively. The grid represent pixels, and the colored crosses correspond to the uncertainty obtained in the fit.

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