\begin{table}%t3
%\centering
\par
\caption{\label{concordancia_numeros}Comparison of the classification of the stars as active or inactive with previous results.}
\begin{tabular}{l c c c c c}
\hline\hline \noalign{\smallskip}
\multicolumn{1}{c}{Dataset}& \multicolumn{2}{c}{\# of common stars} & & \multicolumn{2}{c}{\# of coincidences}\\
\cline{2-3}\cline{5-6}
\noalign{\smallskip}
& \multicolumn{1}{c}{Active} & \multicolumn{1}{c}{Inactive}&  & \multicolumn{1}{c}{Active} & \multicolumn{1}{c}{Inactive}\\
\hline
\cite{1991ApJS...76..383D} & 52 & 90 & & 40 & 75 \\
Strassmeier et~al. (2000)
 & 37 & 21 & & 31 & 20 \\
\cite{2004ApJS..152..261W} & 34 & 92 & & 30 & 84 \\
\cite{2007AJ....133..862H} & 21 & 35 & & 14 & 31 \\
\cite{2008ApJ...687.1264M} & 27 & 54 & & 23 & 47 \\
\hline
\end{tabular}
\end{table}