Celestial maps in ecliptic coordinates of some selected statistics in Gaia EDR3. Panel a: mean parallax uncertainty for sources with five-parameter solutions and G < 14 mag. Panel b: mean correlation coefficient between parallax and pseudo-colour for sources with six-parameter solutions. Panel c: smoothed median parallax of quasars, corrected for the global median offset of − 17 μas. Owing to the small number of quasars identified at small Galactic latitudes, no data are shown for | sin b | < 0.1. The maps use a Hammer–Aitoff projection in ecliptic coordinates with λ = β = 0 at the centre, ecliptic north up, and ecliptic longitude λ increasing from right to left. All three statistics exhibit some degree of systematic dependence on ecliptic latitude, which may be symmetric (as in a) or antisymmetric (as in b and c), but also even larger variations as functions of both coordinates.