Example of a bad calibrated source. Top left panel: c^* vs. G for the star Gaia DR3 5367009382403022592. The two quantities are strongly correlated (r_exf = 0.996). Top right panel: I_G (black bullets) and I_GBP + I_GRP (green bullets) time series. While I_GBP + I_GRP is almost constant vs. time, the I_G time series exhibits temporal variations with a peak-to-peak amplitude of about 20%. This variability is very likely due to instrumental issues, otherwise it should be visible also in the I_GBP + I_GRP time series. Bottom left panel: G_BP and G_RP epoch spectra corresponding to c^* = 0.002. Bottom right panel:G_BP and G_RP epoch spectra corresponding to c^* = 0.29. We note that the G_BP and G_RP epoch spectra are only shown here for illustration; they will be available to the community in Gaia DR4.