Fractional variability, F_var, for the light curves displayed in Fig. 1. Nightly bins are used for MAGIC, three-day bins for Fermi-LAT, and for all other wavebands the single observations are without further binning. The filled orange to violet markers depict F_var when data over the full campaign are considered, and the open turquoise markers only include measurements during the IXPE time window. For Fermi-LAT, F_var cannot be computed during the IXPE window due to a variability level below the statistical uncertainties, leading to a negative value in the square root of the numerator of F_var (see Vaughan et al. 2003).