Single-frame precision as a function of magnitude for stars in the FoV with DE0716−06. 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 DE0716−06 (mI = 17.5).
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