\begin{table}%t5
\caption{\label{sandint5}Literature compilation of abundances estimates for \obj.}
\par
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\par
\begin{tabular}{ccccclllclll}
\hline\hline \noalign{\smallskip}
Ref. & \multicolumn{1}{c}{Spectral}& \multicolumn{1}{c}{$\teff$} & \multicolumn{1}{c}{$\langle\Te\rangle$} & He & \multicolumn{1}{c}{C} & \multicolumn{1}{c}{N} & \multicolumn{1}{c}{O} &  Ne & \multicolumn{1}{c}{C/O} & \multicolumn{1}{c}{N/O} & \multicolumn{1}{c}{Ne/O}\\
 & \multicolumn{1}{c}{domain}& \multicolumn{1}{c}{$[10^3~{\rm K}]$} & \multicolumn{1}{c}{$[10^3~{\rm K}]$}& &&&&&&& \\ 
\hline
\noalign{\smallskip}
\rT  & O  &  150 & -- & & & & $6.3\xx$(0.5) &&&& \\
\rJ  & O&100&17.6& 10.82 &         && 6.93 & 7.47&       && 3.47 \\
\rR  & O &100&30& 10.9$\phantom{0}$  &&     &  6.15 (0.35) & 6.35  &     &     &0.5$\phantom{0}$ (0.3)\\
\rPT & O&130&30&10.91&    &&   $7.5\phantom{0}$ (0.3)&6.65& & & 0.14 (0.14)\\
\rS  & O+U& -- & \multicolumn{1}{c}{--} &   & 7.51 (0.15) & 6.87 (0.19) & 6.85 (0.25) & 6.6$\phantom{0}$ & 4.7$\phantom{0}$ (1.1)& 1.05 (0.15) & 0.65 (0.35)\\
\rJs  & O+U& 130 &30\tablefootmark{a}&10.87& 7.58 &6.94&7.18&6.66&2.5$\phantom{0}$&0.58&0.30\\
this work & O+U& 138 & 21.1&10.88 & 7.90 & \multicolumn{1}{l}{7.47:}& 6.74 & 6.96 & 14$\phantom{.0}$ & 5.4:$\!\!\phantom{0}$ & 1.7$\phantom{0}$\\
$Z\ugd$ & &&&11.04 & 8.89 & 8.39 & 8.65 & 8.01 & 1.74& 0.55 & 0.23\\
BoBn-1 &&&& 11.05 & 8.85 & 8.00 & 7.83 & 7.72 &10.5& 1.48 & 0.78\\
\hline
\end{tabular}
\tablefoot {The table only includes estimates that are based on observed emission lines. Columns~1$-$4 specify the source reference, the wavelength range (O~-- optical, and U -- UV), the stellar effective temperature~(\teff) and the mean electron temperature ($\langle\Te\rangle$) used in the study. Columns~5$-$9 give element abundances using the same units as in Table~\ref{sandint2}. In Cols.~10$-$12 we also give abundance ratios relative to oxygen. Uncertainties are, were provided, given in parentheses. A~colon indicates an uncertain value of our best-match model. The abundances of our best-match model are given in the row marked \emph{this work}. In the last two rows we, for comparison, give the mean abundance distribution of the Galactic disk~($Z\ugd$; Table~\ref{sandint2}) and the halo-PN {\BoBn} \citep[the values of this object are taken from][]{HoHeMc:97}. For further details see Sect.~\ref{sec:discussion}. \\
\tablefoottext{a}{Jacoby (priv.~comm.).}}
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\end{table}