\begin{table}%t6
%\centering
\par
\caption{Newly determined positions of \ion{O}{vi} lines as used in our improved model atom. We compare them to the literature values. The measurements were
made in the \elf\ spectra described in this paper~(J06) as well as in spectra of
other PG~1159~stars (Reiff \etal \cite{Reiff2006}, R06) and hot central stars (Traulsen
\etal \cite{Traulsen2005}, T05).}\label{tab:OVIwavelengths} 
\small\begin{tabular}{cccc}
\hline \hline \noalign{\smallskip}
 Transition &$\lambda_{\rm  old}$ / \AA     &$\lambda_{\rm  new}$ / \AA     &  Remark    \\ \hline
\noalign{\smallskip}
${\rm  4p\; ^2 P^o_{1/2}}$--${\rm  5s\; ^2 S_{1/2}}   $ &1171.56   &1171.10  & T05     \\
${\rm  4p\; ^2 P^o_{3/2}}$--${\rm  5s\; ^2 S_{1/2}}   $ &1172.44   &1172.00  & T05     \\
${\rm  4p\; ^2 P^o_{1/2}}$--${\rm  5d\; ^2 D_{3/2}}   $ &1080.88   &1080.60  & R06        \\
${\rm  4p\; ^2 P^o_{3/2}}$--${\rm  5d\; ^2 D_{3/2}}   $ &1081.62   &1081.34  & R06        \\
${\rm  4p\; ^2 P^o_{3/2}}$--${\rm  5d\; ^2 D_{5/2}}   $ &1081.52   &1081.24  & R06        \\
${\rm  4f\; ^2 F^o_{5/2}}$--${\rm  5d\; ^2 D_{3/2}}   $ &1126.46   &1126.28  & R06        \\
${\rm  4f\; ^2 F^o_{5/2}}$--${\rm  5d\; ^2 D_{5/2}}   $ &1126.35   &1126.17  & R06        \\
${\rm  4f\; ^2 F^o_{7/2}}$--${\rm  5d\; ^2 D_{5/2}}   $ &1126.46   &1126.28  & R06        \\
${\rm  5p\; ^2 P^o_{1/2}}$--${\rm  7d\; ^2 D_{3/2}}   $ &1262.10   &1261.70  &J06  \\
${\rm  5p\; ^2 P^o_{3/2}}$--${\rm  7d\; ^2 D_{3/2}}   $ &1262.20   &1261.80  &J06  \\
${\rm  5p\; ^2 P^o_{3/2}}$--${\rm  7d\; ^2 D_{5/2}}   $ &1261.82   &1261.42  &J06  \\ 
${\rm  5p\; ^2 P^o_{1/2}}$--${\rm  8d\; ^2 D_{3/2}}   $ &1018.21   &1018.81  &J06  \\
${\rm  5p\; ^2 P^o_{3/2}}$--${\rm  8d\; ^2 D_{3/2}}   $ &1018.28   &1018.88  &J06  \\
${\rm  5p\; ^2 P^o_{3/2}}$--${\rm  8d\; ^2 D_{5/2}}   $ &1018.15   &1018.75  &J06  \\ 
${\rm  5d\; ^2 D_{3/2}}  $--${\rm  7f\; ^2 F^o_{5/2}} $ &1289.82   &1290.06  & T05     \\
${\rm  5d\; ^2 D_{5/2}}  $--${\rm  7f\; ^2 F^o_{5/2}} $ &1289.97   &1290.21  & T05     \\
${\rm  5d\; ^2 D_{5/2}}  $--${\rm  7f\; ^2 F^o_{7/2}} $ &1289.94   &1290.18  & T05     \\ 
${\rm  5f\; ^2 F^o_{5/2}}$--${\rm  7d\; ^2 D_{3/2}}   $ &1293.14   &1293.04  & T05     \\
${\rm  5f\; ^2 F^o_{5/2}}$--${\rm  7d\; ^2 D_{5/2}}   $ &1292.74   &1292.64  & T05     \\
${\rm  5f\; ^2 F^o_{7/2}}$--${\rm  7d\; ^2 D_{5/2}}   $ &1292.77   &1292.67  & T05     \\ 
${\rm  5f\; ^2 F^o_{5/2}}$--${\rm  7g\; ^2 G_{7/2}}   $ &1291.91   &1291.81  & T05     \\
${\rm  5f\; ^2 F^o_{7/2}}$--${\rm  7g\; ^2 G_{7/2}}   $ &1291.94   &1291.84  & T05     \\
${\rm  5f\; ^2 F^o_{7/2}}$--${\rm  7g\; ^2 G_{9/2}}   $ &1291.91   &1291.81  & T05     \\
${\rm  5g\; ^2 G_{7/2}}$--${\rm  7f\; ^2 F^o_{5/2}} $ &1292.12   &1292.02  & T05     \\
${\rm  5g\; ^2 G_{7/2}}$--${\rm  7f\; ^2 F^o_{7/2}} $ &1292.09   &1291.99  & T05     \\
${\rm  5g\; ^2 G_{9/2}}$--${\rm  7f\; ^2 F^o_{7/2}} $ &1292.12   &1292.02  & T05     \\
${\rm  5g\; ^2 G_{7/2}}$--${\rm  7h\; ^2 H^o_{9/2}} $ &1291.99   &1291.89  & T05     \\
${\rm  5g\; ^2 G_{9/2}}$--${\rm  7h\; ^2 H^o_{9/2}} $ &1292.02   &1291.92  & T05     \\
${\rm  5g\; ^2 G_{9/2}}$--${\rm  7h\; ^2 H^o_{11/2}}$ &1292.02   &1291.92  & T05     \\ 
\hline 
\end{tabular}  
\end{table}