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Fig. 4


Left panel: recovery fractions of artificial stars inserted within the inner 500   pixel from the centre of the observed field plotted vs. the respective magnitude in the Ks- (lower abscissa) or H-band (upper abscissa). The full and dotted lines correspond to the recovery fractions for the Ks-band data in 2003 and 2008, respectively and the dash-dotted line shows the completeness in the H-band. The dashed line shows the total completeness for the stars after matching the two Ks-band and the H-band datasets. Only stars with Ks < 19   mag are used for the proper motion analysis, as indicated by the vertical dotted line. Right panel: Ks-band image from the second epoch with the overplotted contours representing a completeness level of 50% for the labelled magnitudes.

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