\begin{table}%t1
  %\centering
\par
  \caption{\label{Observation_summary}Summary of Saturn's observations.}
      \begin{tabular}{ccccc}
      \hline\hline
      \noalign{\smallskip}
      Date         & $\tau$(183~GHz) & Number of  & \% of used   & Remarks                                    \\ 
                   &                  & limb scans & scans        &                                            \\
      \hline
      23 Jan. 2009 & 0.04--0.05        &            &              & Observing strategy tests                   \\
      27 Jan. 2009 & 0.05--0.06        & 2          & 100\%        & Observing strategy tests and validation    \\
      30 Jan. 2009 & 0.05--0.06        & 2          & 50\%         & 50\% of the scans lost due to bad pointing \\
      13 Mar. 2009 & 0.05--0.06        & 4          & 50\%         & 50\% of the scans lost due to bad pointing \\
      14 Mar. 2009 & 0.04--0.05        & 4          & 75\%         & 25\% of the scans lost due to bad pointing \\
      \hline
      \end{tabular}
\tablefoot{Indicated: the date of the observations, the zenithal opacity conditions at 183~GHz 
      during the observations, the number of limb scans that have been recorded, the percentage of the scans that have been used in the analysis, 
      and remarks about the performed observations.}
  \end{table}