Error distribution of TGAS parallaxes for Type II Cepheids: whole sample (31 stars, green), subsample with literature photometry and removing variables of RV Tauri type (26 stars, grey), subsample of the previous 26 sources retaining only stars with positive parallax and parallax errors σϖ/ϖ< 0.5 (7 stars, black contour). The bin size is 0.025 mas.
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