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Fig. 2

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Single-frame precision as a function of magnitude for stars in the FoV with DE071606. Measured (dots) and model σm (open circles) values are shown, and the solid line indicates the dominant photocentre uncertainty component for a) the average of a full set of frames; b) an epoch with excellent 0.38′′ seeing. Magnitudes are given relative to DE071606 (mI = 17.5).

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