\begin{table}%T7
%\centering
\small
\caption{Clusters with the largest relative populations of blue 
stragglers ($N_{\rm BS}/N \geq 0.1$).}
\label{tab:nrelativa}
\begin{tabular}{lcc|lcc} \hline\hline
Cluster & $\log \textup{(age)}$ & $N_{\rm BS}/N$ &
Cluster & $\log \textup{(age)}$ & $N_{\rm BS}/N$ \\
\hline 
\object{Ruprecht 46}  &  9.6 &   0.26 &
\object{King 11}    &   9.1 & 0.13   \\
\object{Berkeley 70}  &  9.7  &  0.22 &
\object{NGC 188}   &  9.6  & 0.13 \\
\object{NGC 7142}  &   9.3 & 0.21 &
\object{Pismis 3}   &    9.0 &  0.13 \\
\object{Berkeley 66}   &    9.7 &  0.19 &
\object{Berkeley 21}  &   9.3 &  0.12 \\
\object{Berkeley 14}  & 9.2 &  0.17 &
\object{King 2}    &  9.8 &  0.12 \\
\object{NGC 2682}  &   9.4  &  0.17 & 
\object{NGC 2112}    &  9.3 &  0.12 \\
\object{NGC 7789}   &   9.2  & 0.17   &
\object{NGC 2627} &  9.3 & 0.11   \\
\object{Berkeley 17}  & 10.1 &  0.16 & 
\object{Pismis 2}   &   9.1 & 0.10 \\
\object{Berkeley 32} &  9.5 & 0.16   &
\object{Berkeley 81} &   9.0 &  0.10 \\
\object{NGC 6005}  &   9.1 &   0.16 & & & \\
\hline
\end{tabular}
\end{table}