Formal uncertainties at G ≃ 15 for sources with a five-parameter solution in EDR3. Top: semi-major axis of the error ellipse in position at epoch J2016.0. Middle: standard deviation in parallax. Bottom: semi-major axis of the error ellipse in proper motion. These and all other full-sky maps in the paper except Fig. 12 use a Hammer–Aitoff projection in equatorial (ICRS) coordinates with α = δ = 0 at the centre, north up, and α increasing from right to left.