MAGIC flux versus NuSTAR flux and quantification of the correlation during the IXPE 2 epoch. The MAGIC flux is computed above 400 GeV while the X-ray flux is evaluated in two different energy bands: 3–7 keV for the left panel and 7–30 keV for the right panel. In each panel, the obtained Pearson’s r coefficient is indicated. We specify below the p-value that describes the probability of obtaining the observed r coefficient for two uncorrelated light curves. This p-value was estimated based on Monte Carlo toy simulations (see the main text for more details).