Table 7: QSO 2 surface density.
$f_{\rm } (0.5{-}8~{\rm keV})$ N N(> $f_{\rm x})$
  Known Candidate Total Known Candidate Total
erg cm-2 s-1       deg-2
$1 \times 10^{-15}$ 9 25 34 $\rm 89^{+40}_{-29}$ $\rm 247^{+60}_{-49}$ $\rm 335^{+68}_{-57}$
$2 \times 10^{-15}$ 9 14 23 $\rm 89^{+40}_{-29}$ $1\rm 38^{+48}_{-36}$ $\rm 227^{+58}_{-47}$
$5 \times 10^{-15}$ 7 3 10 $\rm 69^{+37}_{-25}$ $\rm 30^{+29}_{-16}$ $\rm 99^{+42}_{-31}$
$1 \times 10^{-14}$ 3 1 4 $\rm 30^{+29}_{-16}$ $\rm 10^{+23}_{-8}$ $\rm 39^{+31}_{-19}$


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