Error distribution of the TGAS parallaxes for RR Lyrae stars (RRLs): whole sample (364 stars, cyan), subsample with literature photometry (200 stars, blue), subsample of the previous 200 sources retaining only stars with positive parallax and parallax errors σϖ/ϖ< 0.5 (112 stars, black contour). The bin size is 0.025 mas.
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