booktabs_thick_line.tex

\documentclass{scrartcl}
\usepackage{booktabs}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tabular}
\begin{document}
\begin{table}
	\centering
	\caption{Example}
	\begin{tabular}{rccc}
		\toprule
		Thing & Value & Value & Value\\
		\midrule
		A & 1 & 2 & 3\\
		B & 1 & 2 & 3\\
		C & 1 & 2 & 3\\
		\specialrule{2pt}{0.5pt}{0.5pt}
		D & 1 & 2 & 3\\
		E & 1 & 2 & 3\\
		\bottomrule
	\end{tabular}
	\label{tab:example}
\end{table}
\end{document}