\begin{table}%T5
%\centering
\small
\caption{Clusters with massive blue stragglers ($N_{\rm M} > 5$).}
\label{tab:masivos}
\begin{tabular}{lcccc} \hline\hline
Cluster & $\log \textup{(age)}$ & $N_{\rm BS}$ 
& $N_{\rm M}$ & $N_{\rm M} / N_{\rm BS}$
  \\ \hline
\object{Berkeley 14} & 9.2 & 94 & 9 & 0.10 \\
\object{Berkeley 18} & 9.6 & 126 & 28 & 0.22 \\
\object{Berkeley 21} & 9.3 & 51 & 10 & 0.20 \\
\object{Berkeley 66} & 9.7 & 70 & 9 & 0.13 \\
\object{Berkeley 70} & 9.7 & 64 & 12 & 0.19 \\
\object{Melotte 66} & 9.5 & 35 & 8 & 0.23 \\
\object{NGC 1798} & 9.2 & 24 & 6 & 0.25 \\
\object{Ruprecht 46} & 9.6 & 62 & 16 & 0.26 \\
\object{Trumpler 5} & 9.6 & 70 &  15 & 0.21 \\
\hline
\end{tabular}
\end{table}