Fig. 3.
Histograms of uncertainty of RA and declination of the Gaia TGAS (blue), UCAC5 (green), Tycho-2 (red), HSOY (black), and PMA (brown) reference stars, after transforming their coordinates into the epochs of our plates. The thin line is for RA, the thick line is for declination. Only the stars within the areas of our plates are included.
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