Best-fit result of the hadronic model for J0007+5659u, fit to the multiwavelength upper limits, compared with the best-fit result of the leptonic model. The solid blue line represents the SED of γ-ray generated by p–p interaction. The dashed line in red stands for the total SED of γ-ray generated by leptonic interactions. The pointing down arrows denote the upper limits of SED according to the observations of Swift-XRT, Fermi-LAT, and WCDA. Also, the expected sensitivity of 3 × 10⁴ seconds’ observation with EPIC-pn of XMM-Newton has been shown by the thick golden line. The fitting SED of KM2A data with error bar is displayed by a butterfly plot filled in gray.