\begin{table}%T4
\caption{\label{tab:param}Emission model representing the spectral energy distribution of \hessj\ (assuming a distance of 3 kpc).}
\small
%\centering
\par
\begin{tabular}{llrl}
\hline \hline \noalign{\smallskip}
&Parameter & Value  &\\
\hline \noalign{\smallskip}
Electron distribution &$\gamma_{\rm c}$   &$ 1.6\times 10^5$  &\\
&$\gamma_{\rm c1}$  &$ 1.6\times 10^8$ &\\
&$\alpha$           &2.4&\\
&$N$ & $7.0\times10^{-8}$ &e$^{-}$/cm$^3$\\
&$R$&$1.6\times 10^{18}$ &cm\\
Synchrotron&$B$ & 1  &$\mu$G\\
External Compton&$U_{\rm rad}^{\rm CMB}$ & 0.25 &eV/cm$^3$\\
&$U_{\rm rad}^{\rm IR}$ & 2 &eV/cm$^3$\\
 \noalign{\smallskip}\hline 
\end{tabular} 
\end{table}