Table 2: Luminosity sub-samples.
Luminosity range Narrow FeK $\alpha\;EW$

${\rm (erg~s^{-1})}$ (eV)

$1.0\times10^{42}{-}1.8\times10^{44}$ $\rm 190^{+40}_{-50}$

$1.8\times10^{44}{-}6.1\times10^{44}$ $\rm 150^{+70}_{-100}$

$6.1\times10^{44}{-}6.6\times10^{46}$ $\rm 50^{+50}_{-40}$

**Table 2:** Luminosity sub-samples.
Luminosity range	Narrow FeK $\alpha\;EW$
${\rm (erg~s^{-1})}$	(eV)
$1.0\times10^{42}{-}1.8\times10^{44}$	$\rm 190^{+40}_{-50}$
$1.8\times10^{44}{-}6.1\times10^{44}$	$\rm 150^{+70}_{-100}$
$6.1\times10^{44}{-}6.6\times10^{46}$	$\rm 50^{+50}_{-40}$

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