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Column padding in tables

I want to make a table where one column heading has superscript which overlaps with hline above it. How can I increase the height of just that row so that it does not overlap? I tried commands such as \arraystretch, but this increases the whole table which then looks odd in the document. The exact code is copied below (MWE).

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{table}[htbp]
\caption{Some values}
\begin{center}
{
 %\renewcommand{\arraystretch}{1.35}
\begin{tabular}{|c|c|c||c|c|c|}
\hline
& \multicolumn{2}{c||}{L2 Unit} &  \multicolumn{3}{c|}{SUB} \\ \cline{2-6} 
 Unit & $E^{\text{Dyn}}_{\text{L2}}$&  $P^{\text{SUP}}_{\text{L2}}$ &  Number  &$E^{\text{Dyn}}_{\text{SUB}}$ &$P^{\text{SUP}}_{\text{SUB}}$ \\
Size & (unit) & (unit) &  ($N$) &(unit) & (unit) \\\hline
4MB& 0.289& 1.39 &2 & .005 &.006\\\hline
\end{tabular}
}
\end{center}
\end{table}
\end{document}
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1 Answer 1

up vote 6 down vote accepted

You can use a \rule of zero width and the desired height; however, I would like to suggest you the use of the booktabs package to build your tables (this implies giving up on vertical rules, but the result is much better). Below an example with and without booktabs:

\documentclass{article}
\usepackage{amsmath}
\usepackage{booktabs}

\begin{document}

\begin{table}[htbp]
\caption{Some values}
\centering
\begin{tabular}{@{}*{6}{c}@{}}
\toprule
& \multicolumn{2}{c}{L2 Unit} & \multicolumn{3}{c}{SUB} \\ 
\cmidrule(r){2-3}\cmidrule(l){4-6} 
Unit & $E^{\text{Dyn}}_{\text{L2}}$ &  $P^{\text{SUP}}_{\text{L2}}$ 
  & Number & $E^{\text{Dyn}}_{\text{SUB}}$ & $P^{\text{SUP}}_{\text{SUB}}$ \\
Size & (unit) & (unit) & ($N$) &(unit) & (unit) \\
\cmidrule(r){1-1}\cmidrule(lr){2-2}\cmidrule(lr){3-3}
\cmidrule(lr){4-4}\cmidrule(lr){5-5}\cmidrule(l){6-6}
4MB & 0.289 & 1.39 & 2 & .005 & .006\\
\bottomrule
\end{tabular}
\end{table}

\begin{table}[htbp]
\caption{Some values}
\centering
\begin{tabular}{|c|c|c||c|c|c|}
\hline
& \multicolumn{2}{c||}{L2 Unit} &  \multicolumn{3}{c|}{SUB} \\ \cline{2-6} 
\rule{0pt}{14pt}Unit & $E^{\text{Dyn}}_{\text{L2}}$&  $P^{\text{SUP}}_{\text{L2}}$ &  Number  &$E^{\text{Dyn}}_{\text{SUB}}$ &$P^{\text{SUP}}_{\text{SUB}}$ \\
Size & (unit) & (unit) &  ($N$) &(unit) & (unit) \\\hline
4MB& 0.289& 1.39 &2 & .005 &.006\\\hline
\end{tabular}
\end{table}

\end{document}

enter image description here

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Very valuable help. Thanks. –  user984260 Sep 5 '12 at 22:45
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