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%% 
%%  An UIT Edition example
%% 
%%  Example 08-03-9 on page 163.
%% 
%%  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{177.70511pt}
\AtBeginDocument{\setlength\parindent{0pt}}
\StartShownPreambleCommands
\def\yPh{\vphantom{A}}
\let\ol\overline
\StopShownPreambleCommands
\begin{document}
$\overline{x}+\overline{y}=\overline{z}$\\
$ \ol{x} + \ol{A} = \ol{z} $\\[5pt]
$ \ol{x\yPh} + \ol{A} = \ol{z\yPh} $
\end{document}