\begin{table}
\caption{Parameters of HBL template spectra.}
%\centering
\par
 \begin{tabular}{llll}
 \hline \hline\
 Model & $E_{\rm p}$ [TeV] & $\alpha_1$ & $\alpha_2$\\
 \hline
 1 & 3.0 & 1.7 & 2.3 \\
 2 & 2.3 & 1.7 & 2.8 \\
 3 & 0.6 & 1.7 & 2.5 \\
 4 & 10.0 & 1.2 & 2.0 \\
\par
 \hline
 \end{tabular}
 \label{tab:HBLpara}
 \end{table}