\begin{table}%t8
%\centering
\par
\caption{Physical parameters of HD~223460 coronal loops derived from
  the {\it XMM--Newton} observations conducted during revolution 107
  and 200. The electron density is derived from Eq. (1), i.e. $n_{\rm
  e} = 2 \times \sqrt{ EM/(4 \pi \times GF \times R^{2} \times
  L)}$.\label{tab8}}
\par
\begin{tabular}{c   c c c c c}
\hline
\hline
     & $T$ & $EM$ &  $H$  & $L$ &  $n_{\rm e}$ \\
     & (K) & (cm$^{-3}$) & (cm) & (cm) & (cm$^{-3}$) \\
\hline
Rev.~107 & $7.5 \times 10^{6}$ & $72  \times 10^{52}$ & $171  \times 10^{10}$ & $0.9 \times  10^{10}$ & $1.7  \times 10^{10}$ \\
Rev.~200 & $7.7 \times  10^{6}$ & $62  \times 10^{52}$ & $175  \times 10^{10}$ & $1.2  \times 10^{10}$ & $1.3  \times 10^{10}$ \\
\hline
\end{tabular}
\end{table}