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Figure 1: (x, y) measurement errors with respect to to magnitude, for 3 distinct ranges of sky background magnitude. The errors were computed from Gaussian image profile model fits. In the top, all magnitude ranges are displayed. The error-magnitude relation displays a typical distribution, with the increase at the faint magnitude end depending on the sky transparency, as revealed by the 3 sky background magnitude regimes present in our observations. |
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Figure 2: Optical minus radio position offsets with respect to RA and Dec for the 59 northern ICRF sources listed in Table 1. |
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