\begin{table}%t2
\caption{\label{table2}Spectral parameters values with their respective statistical errors for a power law shape with an exponential cut-off, with $\beta = 1$. The fits are performed in the [160 GeV--70 TeV] energy range.}
\par
%\centerline
{
\begin{tabular}{ccccccc}
\hline\hline
Year & $\Phi_0{}^a$ & $\Gamma^b$ & $E_{\rm{cut}}{}^c$ & $E_{\rm{cut,true}}{}^d$ & $I$($\geq$1 TeV)$^e$  & $\chi^{2}$/d.o.f.\\
& $\rm (10^{-12} TeV^{-1} cm^{-2} s^{-1})$ & & (TeV) & (TeV) & $\rm (10^{-12} cm^{-2} s^{-1})$ & \\
\hline 
2004 & 2.40 $\pm$ 0.10 & 2.20 $\pm$ 0.07 & 20.70 $\pm$ 11.80 & 22.20 $\pm$ 11.80 & 1.81 $\pm$ 0.14 & 25/26\\
2005 & 2.56 $\pm$ 0.09 & 1.94 $\pm$ 0.07 & 9.09 $\pm$ 2.13 & 9.61 $\pm$ 2.13 & 2.09 $\pm$ 0.16 & 33/25\\
2006 & 2.35 $\pm$ 0.16 & 2.16 $\pm$ 0.11 & 32.90 $\pm$ 39.50 & 35.50 $\pm$ 39.50 & 1.88 $\pm$ 0.22 & 17/23\\
\hline
All & 2.55 $\pm$ 0.06 & 2.10 $\pm$ 0.04 & 14.70 $\pm$ 3.41 & 15.70 $\pm$ 3.41 & 1.99 $\pm$ 0.09 & 23/26\\
\hline
\end{tabular}}
\par
\medskip
$^a$ Flux normalisation. 
$^b$ Reconstructed spectral index. 
$^c$ Reconstructed cut-off energy without corrections for the systematic bias.  
$^d$ Reconstructed cut-off energy corrected for the systematic bias. 
$^e$ Integrated $\gamma$-ray flux above 1 TeV. 
\end{table}