\begin{table}%T5
  %\centering
\par
  \caption{Parameters representing the best-fit model.
  }\label{tab-5}
   \begin{tabular}{ll}
  \hline\hline
  Parameter & Value\\
  \hline
\par
  {\it CSPN} &\\
  {\it Model atmosphere} &\\
  $T_{\rm eff}  $ &170~000~K \\
  log $g$    & 7.3 \\
  Luminosity & 490 $L_{\smallsun}$\\
  %\\
  {\it Nebula}    & \\
  Const. density & $N_{H} = 1.840 \times 10^3~\rm  cm^{-3}$ \\
  Abundance & H     \hskip 1.0cm He    \hskip 0.9cm C    \hskip 1.0cm N \\
            & 12.000\hskip 0.3cm 11.000\hskip 0.6cm 8.8325\hskip 0.4cm 7.8261
  \\ & O     \hskip 1.0cm Ne    \hskip 0.9cm Mg   \hskip 0.8cm Si \\ & 8.7076
  \hskip 0.4cm 7.9031\hskip 0.4cm 7.3802 \hskip 0.4cm 6.7782\\ & S     \hskip
  1.1cm Cl    \hskip 1.0cm Ar   \hskip 0.9cm K \\ & 6.5441 \hskip 0.4cm
  5.2553\hskip 0.4cm 6.2041 \hskip 0.4cm 4.6990\\ & Ca    \hskip 1.0cm Fe  \\
            & 6.3600 \hskip 0.4cm 5.7500 \\
Size      &$8\farcs7$ (diameter)\\
  Distance  & 2.300~kpc\\
  Inner radius & 4.365158e16~cm (${\sim}0.0141$~pc) \\
  Outer radius & 1.496725e17~cm (${\sim}0.0485$~pc)\\
  Filling factor& 1\\
  \hline
  \end{tabular}
\par
  \end{table}