\begin{table}%t1
  \caption{\label{tab:coords}Position of cluster centres and estimated radii.}
  \begin{tabular}{lrrrrr}
\hline \hline \noalign{\smallskip}\multicolumn{1}{c}{Cluster} &
\multicolumn{1}{c}{$l$} & \multicolumn{1}{c}{$b$} &
\multicolumn{1}{c}{$\alpha_{2000}$} &
\multicolumn{1}{c}{$\delta_{2000}$}
& \multicolumn{1}{c}{$r$}\\
 & \multicolumn{1}{c}{[$^{\circ}$]} &
\multicolumn{1}{c}{[$^{\circ}$]} & \multicolumn{1}{c}{[h:m:s]} &
\multicolumn{1}{c}{[$^{\circ}$~~$^{\prime}$~~$^{\prime\prime}$]}
& \multicolumn{1}{c}{[$^{\prime}$]}\\
\hline
    % after \\: \hline or \cline{col1-col2} \cline{col3-col4} ...
    Cz 29    & 230.81 & +0.96 & 07:28:25 & $-$15:24:00 &1.50\\
    Haff 10    & 230.77 & +1.00 & 07:28:34 & $-$15:21:52 &1.65\\
    Haff 18    & 243.15 & +0.44 & 07:52:39 & $-$26:23:00 &3.90\\
    Haff 19    & 243.08 & +0.52 & 07:52:47 & $-$26:17:00 &3.30\\
    NGC 2383      & 235.27 & $-$2.45 & 07:24:43 & $-$20:57:00 &2.20\\
    NGC 2384      & 235.39 & $-$2.39 & 07:25:10 & $-$21:01:18 &1.75\\
    Rup 72   & 259.55 & +4.37 & 08:52:05 & $-$37:36:00 &--\\
    Rup 158  & 259.55 & +4.42 & 08:52:27 & $-$37:34:00 &--\\
    \hline
  \end{tabular}
\par
\end{table}