\begin{table}%t1
%\centering
\par
  \caption{Summary of observed targets. $\mu=\cos(\theta)$ with
    $\theta$ the observing angle. e time is the effective exposure
    time per line position, i.e., the sum of all exposure times.}
  \label{table:obs}
  \begin{tabular}{ccccc}
    \hline\hline
    date & NOAA number & position [$\degr$] & $\mu$ & e time \\
    \hline
    07-Jan-2006 & AR10845 & N18~E64 & 0.39 & 7.8\\
    10-Jun-2006 & AR10893 & N01~E17 & 0.95 & 7.8\\
    12-Sep-2006 & AR10908 & S09~W12 & 0.94 & 7.5\\
    15-Sep-2006 & AR10908 & S13~W51 & 0.58 & 7.7\\
    \hline
  \end{tabular}
\end{table}