Fig. 6
Difference between the star positions used to derive the object positions as published in the literature and the positions obtained from Gaia DR2, as described in Sect. 2. The x-axis presents the difference (Literature minus Gaia DR2) in Right Ascension (RA ⋅ cosδ), and the y-axis corresponds to the difference in declination. Differences as large as ~300 mas are present.
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