Comparison between Hipparcos and HST parallax (upper panel), TGAS and Hipparcos parallax (middle panel), and TGAS and HST parallax (lower panel) for the classical Cepheids FF Aql, SY Aur, and SS CMa. FF Aql is the brightest star in our sample of 331 classical Cepheids and is known to be a component of a binary system. A dashed line shows the bisector.
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