Top:excess flux for 36 million sources towards the direction l ∈ (10°, 20°) and the b ∈ (−5°, 5°) direction. The black line is the identity and the other ones are the median for different ranges of G. Bottom: excess flux for 14 million sources towards the anticentre direction. The colour code accounts for the ratio between the log₁₀ phot_bp_rp_excess_factor and the relation 0.05 + 0.039(G_BP − G_RP), which is the approximate locus of well behaved stars.