\begin{table}%t1
\caption{\label{tab1}Properties of the LMC RR1 datasets analyzed in this paper.}
\small%\centerline
{
\begin{tabular}{cccc}
\hline\hline
{\rm Set} & $\langle T_{\rm tot} \rangle$ & $\langle N_{\rm d} \rangle$ 
& Colors \\
\hline
\#1   & $6.5$   & $700$   & "$r$'', "$b$'' \\
\#2   & $7.5$   & $900$   & "$r$'', "$b$''  \\
\hline
\end{tabular}}
\smallskip
{Note:} 
$\langle T_{\rm tot} \rangle = $~average total time span [yr];  
$\langle N_{\rm d} \rangle = $~average number of datapoints per variable.  
Colors: MACHO instrumental magnitudes, see Alcock et~al. (\cite{Alcock1999}).
\end{table}