Comparison between the corrected observed G magnitudes and the synthetic G magnitudes as a function of G_phot (left column) and as a function of G_BP, phot − G_RP, phot (right column). The first, second, and third row show the result for MAW, REV, and WEI, respectively. Data points and error bars are color-coded by data set. The region shaded in gray in the right column shows the 1σ confidence range for the unrestricted fit.