Multiwavelength light curves of PKS 0735+178. From top to bottom: 0.1–100 GeV γ-ray photon flux from Fermi-LAT, 0.3–10 keV photon count from Swift/XRT, optical g- and V-band flux densities from ASAS-SN, 15 and 43 GHz flux densities of the VLBI nuclear region from the VLBA (MOJAVE and BEAM-ME; see the text for the definition of the core), and the same, but for the entire compact jet. The vertical dashed gray lines mark the time of the IceCube-211208A event.