Fig. A.1.
Comparison of the typical errors in parallax determination within Gaia DR2 for Wd 1 and other crowded regions of the Galactic plane. Left panel: core of the old open cluster NGC 7789. Right panel: core of the intermediate-age open cluster M11. In both panels, data for Wd 1 is plotted as blue dots, while data for the other cluster is plotted as red dots.
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