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\begin{table}[tbp]
  \caption{ML trials: scoring services after voting from the documents}
  \begin{center}
    \small
    \begin{tabular}{lcc|rrr|rrr}
      \hhline{=========}
      Documents & Threshold & 
      Max. & \multicolumn{3}{c}{traditional \%} & \multicolumn{3}{|c}{BDM \%} \\
      & &
      cat. & $P$ & $R$ & $F_1$   & $AP$ & $AR$ & $AF_1$\\
      \hhline{---------}
      Abstracts \& HTMLs & 0.1 &
      1 & 54.3  & {\slugc}49.8  & {\slugc}52.0  
      & 74.7  & {\slugc}51.7  & {\slugc}61.1  \\
       & 0.1 &
      2 & 35.0  & 52.6  & 42.0  & 50.0  & 55.7  & 52.7  \\
      \hhline{~--------}
       & 0.3 &
      1 & 58.1  & 52.8  & 55.3  & 79.1  & 55.0  & 64.9  \\
       & 0.3 &
      2 & 49.8  & 53.5  & 51.6  & 68.8  & 56.5  & 62.0  \\
      \hhline{=========}
    \end{tabular}
  \end{center}
  \label{tab:ml-voted}
\end{table}
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