Tables

Examples of booktabs/tabularx

\documentclass{book}

\usepackage{booktabs}
\usepackage{tabularx}

\newcolumntype{Y}{>{\centering\arraybackslash}X}

\begin{document}

\begin{table}[htbp]
  \caption[Summary of performance of Share Algorithm with different configurations.]{%
    Summary of AB workload trace generation. Config A corresponds to weighing latency
    and wasted power 2:1. Config B weighs the two equally, while C has a weighting ratio
    of 1:2. Percentages are calulated using means, and are relative to using no PM.}
  \label{table:someLabel}
  \centering
  \begin{tabularx}{\textwidth}{c *{6}{Y}}
    \toprule
    \multicolumn{1}{c}{} & \multicolumn{3}{c}{Power Savings} & \multicolumn{3}{c}{Added Completion Time}\tabularnewline
    \cmidrule(lr){2-4} \cmidrule(lr){5-7}
    \multicolumn{1}{c}{Workload} & A & B & C & A & B & C \tabularnewline
    \midrule
     Normal & $16.6\%$ & $15.6\%$ & $15.9\%$ & $2.0\%$ & $5.1\%$ & $4.2\%$ \tabularnewline
    \bottomrule
  \end{tabularx}
\end{table}

\end{document}

Example taken from Jan-Ove's thesis.