Difference between synthetic G, B p, R p, g, r, and i magnitudes derived from models scaled to match the UVB flux (blue) and scaled to the Gaia parallax (red) with the observed Gaia G, Bp, and Rp magnitudes, and with the g, r, and i magnitudes calculated from the Gaia XP spectra (Gaia Collaboration 2023), for the 14 white dwarfs in our final sample. The size of the error bars depends largely on the propagation of the uncertainties in the stellar parameters corresponding to the models.