Left: spectral energy distribution of the emission produced by electrons injected in the ISM (in red) and JET regions (in blue). A magnetic field B_ISM = 5 μG is assumed for the ISM, whereas a range in the value of B_JET = 5, 10, 15, 20 and 30 μG is probed for the JET region. Particle injection is considered up to t_inj = 10³ yr for the JET region and from t_inj = 10³ yr until t_inj = 20 kyr for the ISM region (red-dotted lines). Particles are assumed to follow a power-law distribution with a low and a high energy cutoff and , respectively. Green and orange vertical bands denote Chandra and MeerKAT frequency coverage. Right: same as in the left panel but for a particle spectrum with a low-energy cutoff .