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\begin{table}[tbp]
  \begin{center}
    \begin{tabular}{|l@{\slugb}l@{\slugb}r|}
      \hhline{|---|}
      Stage & \multicolumn{2}{r|}{Approx.~number}\\
      & \multicolumn{2}{r|}{of documents}\\
      \hhline{|---|}
      Input & total documents & 250~000\\
      \hhline{|---|}
      \multicolumn{2}{|l}{Preprocessing reductions} & \\
      & HTTP error codes & 49~000\\
      & unwanted provider IDs & 5~000\\
      & empty documents & 3~000\\
      & reduced duplicates & 23~000\\
      & faulty XML & $<30$\\
      \hhline{|---|}
      Output & HTML &     37~000\\
      & WSDL &     110~000\\
      & abstract & 25~000\\
      \hhline{|~~-|}
      \multicolumn{2}{|c}{total (31\% reduction)} &    173~000\\
      \hhline{|---|}
    \end{tabular}
  \end{center}
  \caption{Typical results of preprocessing}
  \label{tab:preprocessing}
\end{table}
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\begin{table}[tbp]
  \begin{center}
    \begin{tabular}{|lrr|}
      \hhline{|---|}
      & \multicolumn{2}{c|}{Time in hours}\\
      Tool & Before & After \\
      \hhline{|---|}
      Preprocessor & 3.0 & 18.3\\
      Analysis & 72.9 & 18.1\\
      Archiving & 6.5 & 2.5\\
      \hhline{|~--|}
      Total & 82.4 & 38.9\\
      \hhline{|---|}
    \end{tabular}
  \end{center}
  \caption{Examples of AA performance times}
  \label{tab:aa-times}
\end{table}
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