Table 4: Sources detected in the ACIS-I observation of the NGC 6251 field, within 4 $\hbox {$^\prime $ }$ from the core.
# $\alpha_{{\rm 2000}}$ $\delta_{{\rm 2000}}$ count rate
      (10-4 s-1)
1 $16^{\rm h}32^{\rm m}31\hbox{$.\!\!^{\rm s}$ }8$ $+82^{\rm h}32^{\rm m}16^{\rm s}$ $810 \pm 20$a
2 $16^{\rm h}33^{\rm m}00\hbox{$.\!\!^{\rm s}$ }5$ $+82^{\rm h}31^{\rm m}12^{\rm s}$ $4.8 \pm 1.8$
3 $16^{\rm h}33^{\rm m}21\hbox{$.\!\!^{\rm s}$ }3$ $+82^{\rm h}31^{\rm m}56^{\rm s}$ $5.6 \pm 1.8$
a NGC 6251 nucleus.


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