Probability density plots (see footnote 12) of parallax differences, taken in the sense TGAS minus Hipparcos, for a common subset of 86 928 sources. Top: empirical probability density of Δϖ (solid), and for comparison a normal probability density function with standard deviation 1.14 mas (dashed), equal to the RSE of the differences. Bottom: probability density of the normalised parallax differences (solid), and for comparison the unit normal probability density function (see text for details).
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