Difference of the inserted and recovered magnitudes of artificial stars inserted into the combined image of the Ks-band data in 2008 plotted vs. the magnitude. A high-order polynomial fit to the median and the standard deviation (multiplied by a factor of 1.5) of the magnitude difference within magnitude bins of 1 mag are shown as well. The vertical dotted line indicates the maximum Ks-band magnitude at Ks = 19 mag of stars to be used for the proper motion analysis.
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