Comparison between Hipparcos and TGAS parallaxes obtained from a sample of 188 RR Lyrae stars (black filled circles) which have both measurements. Cyan filled circles mark sources with (σϖ/ϖ)HIPPARCOS< 0.20. Red filled circles are RR Lyrae stars with (σϖ)HIPPARCOS< 0.70. A dashed line shows the bisector. Residuals are TGAS − Hipparcos parallax values.
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