%%
%% The LaTeX Companion, 3ed
%%
%% Example 6-6-7 on page I-473 in "\protect \LmPack {booktabs} --- Formal ruled tables".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See https://www.latex-project.org/lppl.txt for details.
%%

\documentclass{tlc3exa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{135.0pt}
%StartShownPreambleCommands
\usepackage{booktabs}
%StopShownPreambleCommands

\begin{document}
\begin{tabular}{@{}llr@{}}
\toprule
  \multicolumn{2}{c}{Items} &\multicolumn{1}{c}{Price/lb} \\
\cmidrule(r){1-2}             \cmidrule(l){3-3}
   a & b & c                                              \\
\cmidrule(l{10pt}r{10pt}){1-2}\cmidrule(l{10pt}r{10pt}){3-3}
\morecmidrules                \cmidrule(l{5pt}r{5pt})  {2-3}
\addlinespace[5pt]
  Food& Category & \multicolumn{1}{c}{\$}\\
\midrule
  Apples & Fruit  & 1.50 \\        Oranges & Fruit & 2.00 \\
\addlinespace                      Beef & Meat     & 4.50 \\
\specialrule{.5pt}{10pt}{20pt}     x    & y        & z    \\
\bottomrule
\end{tabular}
\end{document}