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%%
%% The LaTeX Companion, 3ed
%%
%% Example 11-7-13 on page II-202 in "Ghostbusters\texttrademark ".
%%
%% 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{57.0pt}
%StartShownPreambleCommands
\usepackage{color,mathtools} \setlength\fboxrule{0pt}\setlength\fboxsep{0pt}
\newcommand\xx[2]{{\scriptscriptstyle #1}\boxed{#2\color{blue}\vrule}\,}
%StopShownPreambleCommands
\begin{document}
$ (a) \xx{1}{\mathstrut} % normal strut (size of parentheses)
\xx{2}{\xmathstrut{0}} % 0 gives normal strut
\xx{3}{\xmathstrut{0.5}} % add 50% at top + bottom (= 100% bigger)
\xx{4}{\xmathstrut[0]{-0.2}} % remove 20% from top, but keep bottom
\xx{5}{\xmathstrut[0.3]{-1}} % bottom 30% larger, no height
\xx{6}{\xmathstrut{-0.5}} (z) $ % -> see explanation below ...
\end{document}
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