Comparison between Hipparcos and HST parallaxes (upper panel), TGAS and Hipparcos (middle panel), TGAS and HST (lower panel) for the RR Lyrae stars RR Lyr, RZ Cep, SU Dra, XZ Cyg, and UV Oct. Two values from Benedict et al. (2011) are shown for RZ Cep: 2.12 mas (grey filled square) and 2.54 mas (black filled square). TGAS parallax for RZ Cep is in good agreement with the larger, less favoured value in Benedict et al. (2011). Dashed lines show the bisectors.
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