Comparison between Hipparcos and TGAS parallaxes obtained from a sample of 248 classical Cepheids which have both measurements. Red and magenta filled circles represent stars with (σϖ)HIPPARCOS< 0.50 and 0.30 mas, respectively; cyan filled circles are two stars with (σϖ/ϖ)HIPPARCOS< 0.20, namely V2081 Cyg and PR Peg. A dashed line shows the bisector. Residuals are TGAS − Hipparcos parallax values.
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