\begin{table}%t3
%\centering
\par
\caption{Photospheric oxygen lines identified in the Chandra spectrum. 
 ":'' denotes uncertain identifications. \ion{O}{v}~lines are not detectable
 ("-'') but included here, because their absence is discussed in the text.
\label{chandra_o_lines_tab}
}
$$
\begin{tabular}{lr@{--}ll}
       \hline
     \hline
      \noalign{\smallskip}
$\lambda$/\AA & \multicolumn{2}{c}{Transition} & \\
      \noalign{\smallskip}
     \hline
\ion{O}{v} & & \\
     \hline
\noalign{\smallskip}
114.36 & 2s~$^1$S & 8p~$^1$P$^{\rm o}$ & - \\
116.16 & 2s~$^1$S & 7p~$^1$P$^{\rm o}$ & - \\
119.10 & 2s~$^1$S & 6p~$^1$P$^{\rm o}$ & - \\
124.62 & 2s~$^1$S & 5p~$^1$P$^{\rm o}$ & - \\
      \noalign{\smallskip}
     \hline
\ion{O}{vi} & & \\
     \hline
      \noalign{\smallskip}
93.07          & 2s\hses &      10 & :\\
93.91          & 2s\hses &   9p & :\\
95.08          & 2s\hses &   8p & \\
96.84          & 2s\hses &   7p & \\
99.60, 99.66   & 2p      &  17 & \\
99.69          & 2s\hses &  6p & \\
99.78, 99.83   & 2p      &      16 & \\
99.99, 100.00  & 2p      &      15 & \\
100.25, 100.31 & 2p      &      14 & \\
100.58, 100.63 & 2p      &      13 & \\
100.99, 101.04 & 2p      &      12 & \\
101.51, 101.57 & 2p      &      11 & \\
102.24, 102.30 & 2p      &      10 & \\
103.21, 103.26 & 2p      &   9d & \\
103.34, 103.40 & 2p      &   9s & \\
104.61, 104.67 & 2p      &   8d & \\
104.80, 104.86 & 2p      &   8s & \\
104.81         & 2s\hses &   5p & \\
106.73, 106.79 & 2p      &   7d & \\
107.02, 107.08 & 2p      &   7s & \\
110.15, 110.22 & 2p      &   6d & \\
110.66, 110.72 & 2p      &   6s & \\
115.82, 115.83 & 2s\hses &   4p & \\
116.35, 116.42 & 2p      &   5d & \\
117.33, 117.40 & 2p      &   5s & \\
129.78, 129.87 & 2p      &   4d & \\
132.22, 132.31 & 2p      &   4s & \\
150.09, 150.12 & 2s\hses &   3p & \\
\hline
     \end{tabular}
     $$
\end{table}