Examples of the model templates included in AGNFITTER-RX for the physical components responsible for the emission of the host galaxy and its star-forming regions. At radio frequencies, the host-galaxy SED is dominated by the synchrotron emission associated with the diffusion of cosmic rays from SNR and PWN acceleration sites through the galaxy ISM, and the IR emission is dominated by the cold dust emission (green lines), both of which are associated with regions of high star-formation. The NIR–optical–UV emission is dominated by the stellar emission (yellow lines). The upper panel shows a subsample of semi-empirical templates by Chary & Elbaz (2001) and Dale & Helou (2002) for the emission from star-forming regions and the stellar population synthesis models by Bruzual & Charlot (2003) for SFH of 0.05 × 10⁹ yr, and different ages and metallicities. The lower panel shows theoretical models for cold dust by Schreiber et al. (2018) for increasing dust temperatures and f_pah smoothly joined to the radio emission estimated with the FIR-radio correlation (Eq. (1)).