Analysis of the astrometric uncertainties for the J-band. The y-axes is in units of milli-arcseconds. Each column depicts the uncertainties associated to: (1) relative astrometry measured on a single chip and pointing (F6, chip1 is shown as an example); (2) a combination of chips for a given pointing (F6 shown as an example); (3) a combination of all fields for the central region; (4) a combination of the three different bands for the central region. The plots in Cols. 2–4 show steps in the distributions which are caused by systematic offsets between different chips, pointings, and filters.
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