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\begin{table*}[tbp]
  \begin{center}
    \begin{tabular}{|l|r@{\slug}r@{\slug}r|r@{\slug}r@{\slug}r|}
      \hhline{|-------|}
      Crawl & \multicolumn{3}{|c}{traditional \%} & \multicolumn{3}{|c|}{BDM \%} \\
      & $P$ & $R$ & $F_1$   & $AP$ & $AR$ & $AF_1$\\
      \hhline{|-------|}
      1 & 35.8  & 16.3  & 22.4 & & & \\
      2 & 39.3  & 12.4  & 18.9 & & & \\
      3 & 20.0  & 31.6  & 24.5 & 38.4  & 40.3  & 39.3 \\
      \hhline{|-------|}
    \end{tabular}
  \end{center}
  \caption{Evaluation of keyword-based service categorization (limited to two
    categories per service)}
  \label{tab:keyword-eval}
\end{table*}
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