Map of the parameter M₁₀ in the direction of the Galactic centre; M₁₀ is the median G magnitude (here in HEALPix regions of level 10) of Gaia sources with astrometric_matched_transits ≤10, reflecting the outcomes for faint sources of the Gaia pipeline completeness decisions. The complex pattern results from the combination of the Gaia scanning law and stellar density, which in turn depends on Galactic structure and dust distribution. Prominent patches with bright M10 can be seen. Several globular clusters are also visible, for instance the prominent M 22 near (ℓ, b) = (10, −7.5).