\begin{table}%t3
\caption{Physical parameters of the plasma in Head and Tail$^{a}.$}
\label{tab:diffuse_sum}
%\centerline
{
\begin{tabular}{p{0.3\linewidth}p{0.3\linewidth}p{0.3\linewidth}}
\hline\hline
Parameters & Head & Tail \\
\hline
$n_{\rm e}$\ [${\rm cm^{-3}}$] & 0.28 (0.26--0.29) & 0.27 (0.23--0.30) \\
$t_{\rm p}$\ [$10^6$~yr] & ($>$1.8) & 1.1 ($>$0.2) \\
$E$\ [$10^{50}~{\rm erg}$]$^{b}$ & 2.9 (2.2--3.7) & 0.6 (0.5--0.7) \\
$M$\ [$M_\odot$] & 132 (122--137) & 89 (76--99) \\
\hline
\end{tabular}}
\medskip
$^{a}$ Parentheses indicate single parameter 90\% confidence regions. \\
$^{b}$ Thermal energy~$E$ is estimated to be $3n_{\rm e}VkT$.
\end{table}