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Fig. 2

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Mean values of the differences in the sense O–C in right ascension and declination for the reference stars as a function of the magnitude. Each dot represents the mean of at least 100 points in the case of the WFI (left panels) and 14 points in the case of the SOI (right panels). The error bars are standard deviations of the mean and are plotted 1σ above and below the corresponding dot. The difference between the magnitudes of the points associated to a given dot do not exceed one. The corresponding magnitude in the X-axis is the respective mean magnitude.

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