...$P_{1.4},L_{\rm X}$)

Radio powers that have been measured at different frequencies are converted at 1.4 GHz with a spectral index $\alpha=1.3$, with $S\propto \nu^{-\alpha}$.

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... GHs

This value should be considered as a lower limit since MHs have also more peaked profiles than GHs.

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... losses

$B_{\rm cmb}\approx 3.2(1+z)^2~\mu$G is the equivalent magnetic field strength of the cosmic microwave background (CMB) radiation.

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