Fig. 1.
Comparison between the HIPPARCOS and the Gaia DR2 parallaxes for 139 stars in common with our sample of Galactic carbon stars. Typical parallax errors are of the order of 50% (or even larger) for HIPPARCOS and smaller than 15% for Gaia. Error bars are omitted in the plot for clarity. The HIPPARCOS parallaxes are systematically larger for sources with Gaia ϖ ≲ 1 mas. See text for details.
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