Surface density distribution for Gaia DR2 and the new external catalogues (see Sect. 4) obtained using a HEALPix (Hierarchical Equal Area isoLatitude Pixelization, Górski et al. 2005) tessellation with resolution Nside = 28 for dense surveys and Nside = 26 for sparse catalogues. In grey we indicate areas that are not covered by the survey. The surface density distribution of external catalogues that were also matched with Gaia DR1 can be found in Paper I.
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