Spectrum of PG 1004+130, from radio frequencies up to X-rays. To explain this spectrum it is necessary to simulate four processes: the synchrotron radiation of the jet (radio → IR), grey-body emission of dust inside the host galaxy (IR → optical), thermal emission of the accretion disk (optical → UV), and the inverse-Compton scattering inside the jet (X-rays). In addition, we add a weak hard X-ray emitting corona, which is absorbed by circumnuclear gas with a large column density on the line of sight.