Distribution of the confusion sources in Gaia EDR3. These maps use a Hammer-Aitoff projection in galactic coordinates, with l = b = 0 at the centre, north up, and l increasing from right to left. The black lines bound the Galactic zone | sin b | < 0.1 where sources are normally excluded by Eq. (4). Top: sources with five-parameter solutions. Bottom: sources with six-parameter solutions.