Table 5: Clusters with massive blue stragglers ( $N_{\rm M} > 5$).
Cluster $\log \textup{(age)}$ $N_{\rm BS}$ $N_{\rm M}$ $N_{\rm M} / N_{\rm BS}$
Berkeley 14 9.2 94 9 0.10
Berkeley 18 9.6 126 28 0.22
Berkeley 21 9.3 51 10 0.20
Berkeley 66 9.7 70 9 0.13
Berkeley 70 9.7 64 12 0.19
Melotte 66 9.5 35 8 0.23
NGC 1798 9.2 24 6 0.25
Ruprecht 46 9.6 62 16 0.26
Trumpler 5 9.6 70 15 0.21

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