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Fig. 1


Residuals between predicted and measured positions of the Gaia satellite. The astrometry has been calibrated with PPMXL (left panel) and Gaia DR1 (right panel). Each symbol corresponds to the average over a sequence of several frames over 30 min maximum (VST: filled symbols; LT: open symbols). Squares and circles indicate residuals in right ascension and declination respectively.

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