[Tex/LaTex] booktabs with custom column spacing

booktabstables

I'm trying to use the booktabs package, and I'm trying to make tables with "column groups" that are delimited by extra space. In the following, I am doing this using the @{} syntax in the tabular environment header. Unfortunately, however, this seems to ruin the alignment of the multicolumns and the cmidrules. Any ideas how I can fix this?

\documentclass{article}
\usepackage{booktabs}
\begin{document}
\begin{table}
 \centering
 \begin{tabular}{cc @{\hskip 4\tabcolsep}
    *{2}{c} @{\hskip 4\tabcolsep}
    *{2}{c} @{\hskip 4\tabcolsep}
    *{2}{c} }
  \toprule
  & & \multicolumn{2}{c}{A} & \multicolumn{2}{c}{B} &  
\multicolumn{2}{c}{C}\\
  \cmidrule(lr){3-4} \cmidrule(lr){5-6}
\cmidrule(lr){7-8}
  & D & E & F & E & F & E & F\\
  \midrule
  G    & 4.6 & 1.7 & 0.35 & 0.30 & 0.5 & 0.21 & 0.24\\
  H    & 6.5 & 2.7 & 1.4  & 1.2  & 1.3  & 0.30 & 5\\
  I    & 8.7 & 7.3 & 4.6  & 8.5  & 89.3  & 3.7  & 2\\
  J    & 1.4  & 13  & 9.7  & 13   & 8.7  & 8.2   & 4\\
  K    & 5 & 2  & 85   & 18   & 74   & 2.9   & 0.24\\
  \bottomrule
  \end{tabular}
\end{table}
\end{document}

Best Answer

Two things help, in conjunction:

  1. Adjusting the header of \multicolumns to @{}c@{\hskip 4\tabcolsep} --- this deals with the alignment
  2. Adjusting the right trim of \cmidline: (lr{\dimexpr 4\tabcolsep+0.5em}) --- this deals with line lengths

The full code of the upper part of the table is thus:

  \toprule
  & & \multicolumn{2}{@{}c@{\hskip 4\tabcolsep}}{A} & \multicolumn{2}{@{}c@{\hskip 4\tabcolsep}}{B} &  
\multicolumn{2}{c}{C}\\
  \cmidrule(lr{\dimexpr 4\tabcolsep+0.5em}){3-4} \cmidrule(lr{\dimexpr 4\tabcolsep+0.5em}){5-6}
\cmidrule(lr){7-8}
  & D & E & F & E & F & E & F\\
  \midrule

I suspect you will want to further tweak the line lenghts and/or use decimal point alignment...

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