Absolute difference between the un-reddened GaiaBP, RP, and G magnitudes and our mean magnitudes derived from the light curve fit. The colours are the same as in Fig. 1. The y-axis range is restricted to highlight the region of interest, excluding a few outliers. The dashed black line shows the linear fit, and the shaded region denotes the 1σ confidence interval of the regression. The resulting fit parameters (slope and intercept) and their uncertainties are reported within each panel.