SEDs computed from scenario 0, for typical cases of low (Ṁ_∗ = 0.1 M_⊙/yr, left) and high (Ṁ_∗ = 10 M_⊙/yr, right) SFRs. The coloured lines (solid for the primary CRs and dashed for the secondary CRs) are the individual contributions of different non-thermal radiative mechanisms (the colour-coding is the same as in Fig. 2). The dashed brown line is the thermal free-free emission; the grey shaded region represents the Fermi-LAT energy range; and the vertical dotted black lines show the studied radio frequencies (150 MHz and 1.4 GHz).