Table 2: Characteristics of the sources. Fluxes and luminosities have been derived from XMM-Newton slew observations.
Source name Redshift $F_{\rm0.2{-}2~keV}$ $L_{\rm0.2{-}2~keV}$
    [erg s-1 cm-2] [erg s-1]

NGC 3599
0.0028 $7.1\times10^{-12}$ $1.22\times10^{41}$
SDSS J132341.97+482701.3 0.0875 $2.3\times10^{-12}$ $4.39\times10^{43}$
SDSS J093922.90+370944.0 0.1845 $2.7\times10^{-12}$ $2.63\times10^{44}$
2MASX J02030314-0741514 0.0615 $3.1\times10^{-12}$ $2.82\times10^{43}$
2MASX J02491731-0412521 0.0186 $2.7\times10^{-12}$ $2.07\times10^{42}$


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