Notes. Column 1: radio continuum components used to estimate the magnetic field. Values of c₁₂ in Col. 2 were calculated from Eqs. (3), (16), and (17) of Govoni & Feretti (2004); the coefficient, k, in Col. 3 was obtained from Table 1 of Beck & Krause (2005). Column 4: synchrotron luminosity integrated between the limits of the C band. Column 5: approximate spherical radius of each component, obtained from the geometrical average of their deconvolved Gaussian size. Following Carrasco-González et al. (2010), we assume a filling factor of 0.5 (Col. 6). Column 7: minimum-energy magnetic field strength estimated from the formula in Sect. 3.