\begin{table}%t1
%\centering
\par
\caption{\label{table:2}CELESTE sensitivity to the diffuse signal for the spectral mo\-dels of Eq.~(\ref{Eq1}) and an observation time of 10h, in case of no diffuse signal expected in the OFF$_2$ region.} 
\small 
\begin{tabular}{cccc}
\hline\hline\noalign{\smallskip}
$\Gamma$ & $n_\gamma$ $({\rm min}^{-1})$ & $Q$ & $N_{\sigma}$ for $T_{\rm obs}=10$~h\\
\hline
2.0 &  $1.45 \pm 0.03$  & 1.39   &  0.9\\
%\hline
2.5 & $ 0.36 \pm 0.01 $ & 0.96   & 0.2\\
\hline
\end{tabular}
\end{table}