Error distribution of TGAS parallaxes for classical Cepheids (CCs, in the label): whole sample (331 stars, pink), subsample with literature photometry after removing binaries and retaining only fundamental-mode (F) pulsators (102 stars, magenta), subsample of the previous 102 sources retaining only stars with positive parallax and parallax errors σϖ/ϖ< 0.5 (33 stars, black contour). The bin size is 0.025 mas.
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