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+%%
+%% An UIT Edition example
+%%
+%% Example 04-11-4 on page 61.
+%%
+%% Copyright (C) 2010 Herbert Voss
+%%
+%% It may be distributed and/or modified under the conditions
+%% of the LaTeX Project Public License, either version 1.3
+%% of this license or (at your option) any later version.
+%%
+%% See http://www.latex-project.org/lppl.txt for details.
+%%
+%%
+%% ====
+% Show page(s) 1
+%%
+\documentclass[]{exaarticle}
+\pagestyle{empty}
+\setlength\textwidth{129.70511pt}
+\makeatletter
+\def\@bracketheight{2pt}
+\def\underbracket{%
+ \@ifnextchar[{\@underbracket}{\@underbracket[\@bracketheight]}}
+\def\@underbracket[#1]{%
+ \@ifnextchar[{\@under@bracket[#1]}{\@under@bracket[#1][0.4em]}}
+\def\@under@bracket[#1][#2]#3{%\message {Underbracket: #1,#2,#3}
+ \mathop{\vtop{\m@th\ialign{##\crcr $\hfil \displaystyle {#3}\hfil $%
+ \crcr\noalign{\kern 3\p@ \nointerlineskip }\upbracketfill {#1}{#2}
+ \crcr\noalign{\kern 3\p@ }}}}\limits}
+\def\upbracketfill#1#2{$\m@th \setbox \z@ \hbox {$\braceld$}
+ \edef\@bracketheight{\the\ht\z@}\bracketend{#1}{#2}
+ \leaders \vrule \@height #1 \@depth \z@ \hfill
+ \leaders \vrule \@height #1 \@depth \z@ \hfill \bracketend{#1}{#2}$}
+\def\bracketend#1#2{\vrule height #2 width #1\relax} %$
+\makeatother
+\AtBeginDocument{\setlength\parindent{0pt}}
+\StartShownPreambleCommands
+
+\StopShownPreambleCommands
+\begin{document}
+$\underbracket{foo~bar}$ $\underbracket[.1pt]{foo~bar}$
+$\underbracket[2pt][1em] {foo~bar}$
+\end{document}