Table 2: Mean spectral properties from the stacking analysis of optically unobscured, optically obscured AGN and of the subclass of SFG objects. $N_{\rm H}$ is fixed to the galactic value.
Optically unobscured AGN Optically obscured AGN
Flux bins N. of sources $\Gamma $ Flux bins N. of sources $\Gamma $

$-14.1 < \mbox{log}~F_{\rm X} < -13.6$		 12 $\rm 1.91^{+0.12}_{-0.12}$ $-14.1 < \mbox{log}~F_{\rm X} < -13.7$ 16 $\rm 1.60^{+0.10}_{-0.09}$
$-13.6 < \mbox{log}~F_{\rm X} < -13.5$ 8 $\rm 2.04^{+0.09}_{-0.09}$ $-13.7 < \mbox{log}~F_{\rm X} < -13.6$ 19 $\rm 1.75^{+0.07}_{-0.07}$
$-13.5 < \mbox{log}~F_{\rm X} < -13.3$ 7 $\rm 1.85^{+0.11}_{-0.10}$ $-13.6 < \mbox{log}~F_{\rm X} < -13.4$ 12 $\rm 1.57^{+0.09}_{-0.08}$
$-13.3 < \mbox{log}~F_{\rm X} < -12.9$ 3 $\rm 2.13^{+0.21}_{-0.20}$ $-13.4 < \mbox{log}~F_{\rm X} < -12.9$ 6 $\rm 1.49^{+0.10}_{-0.09}$
      SFGs
      $-14.1 < \mbox{log}~F_{\rm X} < -13.6$ 7 $\rm 1.33^{+0.17}_{-0.16}$
      $-13.6 < \mbox{log}~F_{\rm X} < -12.9$ 6 $\rm 1.21^{+0.11}_{-0.10}$


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