Residuals between Gaia EDR3 photometry and synthetic magnitudes obtained with the final passbands and computed for a sample of ~100 000 SEDs obtained from externally calibrated BP and RP spectra for G (top), G_BP (middle), G_RP (bottom) as function of G magnitudes (left) and G_BP − G_RP (right). The colours red, blue, dark, and light grey indicate sources with G < 10.8, 10.8 < G < 13, 13 < G < 16, and G > 16, respectively.