\begin{table}%T2
%\centering
\par
  \caption{Lines detected above 5$\sigma$ in the spectrum of GRB~991216.}
  \label{tab:lines991216}
  \begin{tabular}{crrc}
    \hline
    \hline
\par
    $\lambda_{\rm obs}$ &
    $W_{\rm obs}$ (\rm\AA) &
    \rm ID &
    $z_{\rm abs}$ \\
    \hline
    4587 &  $6.6 \pm 1.3$ & \rm Fe{\sc ii}~\l 2600 & 0.764 \\
    4689 &  $6.2 \pm 1.0$ & \rm Fe{\sc ii}~\l 2600 & 0.803 \\
    4957 &  $7.0 \pm 0.8$ & \rm Mg{\sc ii}~\l 2800 & 0.770 \\
    5047 & $11.0 \pm 0.7$ & \rm Mg{\sc ii}~\l 2800 & 0.803 \\
    5662 &  $6.6 \pm 0.6$ & \rm Mg{\sc ii}~\l 2800 & 1.022 \\
    \hline
  \end{tabular}
\end{table}