\begin{table}%t2
\caption{\label{t2}Elemental abundances of Balloon~090100001. Average values
  with standard deviations are given, if more than one line was
  fitted. Single line measurements are given without errors. Upper
  limits are only given, if they constrain the abundances in a
  reasonable way. $\log~\epsilon=12-\log(n(M)/n(H))$.  $[M/H]$
  abundances relative to solar values are taken from Grevesse \& Sauval
  (\cite{grevesse}). The abundances of the comparison star Feige~48
  are derived from optical spectra using mostly the same line data as
  well as line lists, and are taken from Heber et~al.~(\cite{heber00}).}
%\centering
\par
\begin{tabular}{lllll}
\hline
\hline
& & & & Feige~48 \\
Ion & $N_{\rm lines}$ & $\log~\epsilon$   &  $[M/H]$ & $\log~\epsilon$  \\
\hline
     C~{\sc ii} &  2      &  6.60 $\pm$ 0.14  & --1.92 &  \\
    C~{\sc iii} &  1      &  7.10             & --1.42 & 7.36 $\pm$ 0.03 \\
     N~{\sc ii} &  11     &  7.55 $\pm$  0.12 & --0.37 &  7.47 $\pm$ 0.17 \\
    N~{\sc iii} &         & $<$7.90           & $<$-0.02 &  7.80 $\pm$ 0.11 \\
     O~{\sc ii} &  10     & 7.78 $\pm$  0.08  & --1.05 &  7.79 $\pm$ 0.12 \\ 
    Mg~{\sc ii} &  1      &  6.80             & --0.78 &  6.91 \\ 
   Al~{\sc iii} &         & $<$5.66           & $<$-0.81 &  5.50 $\pm$ 0.18 \\ 
   Si~{\sc iii} &  3      & 6.83 $\pm$  0.15  & --0.72 &  6.39 $\pm$ 0.32 \\ 
    Si~{\sc iv} &         & $<$6.98           & $<$-0.57 & 6.17 \\
    P~{\sc iii} &         & $<$4.94           & $<$-0.51 &  \\
    S~{\sc ii} &          & $<$6.50           & $<$-0.83 &  \\
    S~{\sc iii} &  1      & 6.60              & --0.73 & 6.15 \\
    Ar~{\sc ii} &         & $<$6.80           & $<$0.40 & \\
    Ti~{\sc iii} &        & $<$5.68           & $<$0.66 & \\
    Fe~{\sc iii} &  8     & 7.38 $\pm$  0.23  & --0.12 & 7.55 $\pm$ 0.19 \\
\hline\\
\end{tabular}
\end{table}