MWL SED of QSO B1420+326 in 2020 January and February. Points follow the colors of the shaded regions in Fig. 1. In addition we show XMM points taken on 2020 January 24 (MJD = 58872) in black. MAGIC points are not corrected for the EBL absorption. Gray points show archival data (most from the ASI Space Science Data Center, but also including low-state Fermi-LAT spectrum and lowest and highest X-ray spectrum from Swift-XRT).