\begin{table}%t2
\caption{\label{stacktype}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.}
\small%\centering
\par
\begin{tabular}{lrclrc}
\hline \hline
\multicolumn{3}{c}{Optically unobscured AGN} & \multicolumn{3}{c}{Optically obscured AGN} \\
Flux bins	& N. of sources	& $\Gamma$ & Flux bins	& N. of sources	& $\Gamma$ \\
\hline\noalign{\smallskip}
$-14.1 < \mbox{log}~F_{\rm X} < -13.6$ & 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 & $\rm 1.49^{+0.10}_{-0.09}$ \\
			&	&			& \multicolumn{3}{c}{SFGs} \\
\hline
			&	&			& $-14.1 < \mbox{log}~F_{\rm X} < -13.6$ & 7 & $\rm 1.33^{+0.17}_{-0.16}$ \\
			&	&			& $-13.6 < \mbox{log}~F_{\rm X} < -12.9$ & 6 & $\rm 1.21^{+0.11}_{-0.10}$ \\
\hline
\end{tabular}
\end{table}