Corrected BP and RP flux excess vs. G_BP − G_RP colour distribution for a selection of nearby sources with magnitude G > 17 and more than five calibrated epoch spectra in both BP and RP. In this plot the corrected flux excess has been computed after removing the median background residual flux for both BP and RP for each source. Sources are colour-coded by the median residual background as in the top panel of Fig. 19. See Table 1 for an estimate of the impact of the residual background flux at different magnitudes.