The SED of PBC J2333.9–02343 using simultaneous data from the VLBA and XMM-Newton observatories. The grey stripe corresponds to the 5σ sensitivity of Fermi/LAT after 1 yr (top margin) and 5 yr (bottom margin) of observations. The solid lines refer to the theoretical models: for the continuous red line it is assumed that the seed photons used for the Inverse Compton scattering are the synchrotron ones produced by the same electrons (SSC); for the continuous blue line the process is External Compton (EC) with seed photons produced by the torus. The black dashed line represents the disc; the red dashed line represents the corona.