Fig. A.7

image

From left to right: standard uncertainties on the astrometric parameters of individual stars as a function of magnitude in ω Cen and NGC 5272, and standard uncertainties on the photometric data for NGC 5272. The photometric data clearly show the variability of the RR Lyrae stars (around G = 15.3), while the astrometric data also show locally much increased uncertainties at the same brightness.

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