SED of 3C 273 – modelling compared to data from Turler et al. (1999). The synchrotron emission is shown in blue, the SSC in green, and the external Compton in purple. The torus emission is shown in red and the multicolor accretion disc in orange (filled orange curve), complete with a power-law describing the hot corona emission between 0.02 and 200 keV (dashed orange line). Different emission zones in the jet are represented with different dotted lines. The emission below 10⁹ Hz not reproduced by the model is interpreted as the emission from the jet hot spot, not modelled here.