Parallax standard uncertainties as a function of magnitude for Hipparcos (van Leeuwen 2007) and the primary astrometric data set in Gaia DR1, compared to the predicted 5-yr Gaia mission parallax standard uncertainties. The band for the 5-yr mission predictions indicates the expected variation as a function of celestial position. The colour coding for the Hipparcos and Gaia DR1 parallax uncertainty distributions indicates increasing numbers of sources from light to dark colours (logarithmic scale). The contours enclose 10, 50, 68.3, and 90 per cent of the data in the case of Hipparcos, while for Gaia DR1 they enclose 10, 50, 68.3, 95.4, and 99.7 per cent of the data.
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