VHE energy flux vs X-ray flux using MAGIC and Swift-XRT observations throughout the multi-wavelength campaign. The MAGIC data are binned nightly with a typical exposure time per night of about 40 min. The Swift-XRT observations are binned per observation (typical exposure time of ≈15 min). Only pairs of measurement within 3 hours are considered. The MAGIC fluxes are computed in the > 1 TeV band (top panels) and in the 0.2–1 TeV band (lower panels). The Swift-XRT fluxes are computed in the 0.3–2 keV (left panels) and 2–10 keV bands (right panels). The black filled squares are the measurements during the IXPE observing window. In each subpanel we display the DCF value (and uncertainty) and the corresponding significance in Gaussian σ units in parentheses. For completeness, the Pearson’s R coefficient and its significance are also given. The significance is determined based on dedicated Monte Carlo simulations (see Sect. 4 for more details).