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+%%
+%% An UIT Edition example
+%%
+%% Example 10-10-7 on page 226.
+%%
+%% 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{375.57637pt}
+\AtBeginDocument{\setlength\parindent{0pt}}
+\StartShownPreambleCommands
+\usepackage{amsmath}
+\newlength{\myVSpace}\setlength{\myVSpace}{1ex}
+\newcommand\xstrut{\rule[-0.5\myVSpace]{0pt}{\myVSpace}}
+\StopShownPreambleCommands
+\begin{document}
+\begin{align*}
+\left.\begin{aligned}
+\xstrut\varphi\left(z_1\right) &= P\frac{-i}{2\left(s_1-s_2\right)\left(1+is_1\right)}
+ \left[1-\frac{z_1}{\sqrt{z_1^2-R^2\left(1+s_1^2\right)}}\right]\\
+\xstrut\psi\left(z_2\right) &= P\frac{+i}{2\left(s_1-s_2\right)\left(1+is_2\right)}
+ \left[1-\frac{z_2}{\sqrt{z_2^2-R^2\left(1+s_2^2\right)}}\right]
+\end{aligned}\right\} \text{some text}
+\end{align*}
+
+\addtolength{\myVSpace}{3cm}% see preamble for definition
+\begin{align*}
+\left.\begin{aligned}
+\xstrut\varphi\left(z_1\right) &= P\frac{-i}{2\left(s_1-s_2\right)\left(1+is_1\right)}
+ \left[1-\frac{z_1}{\sqrt{z_1^2-R^2\left(1+s_1^2\right)}}\right]\\
+\xstrut\psi\left(z_2\right) &= P\frac{+i}{2\left(s_1-s_2\right)\left(1+is_2\right)}
+ \left[1-\frac{z_2}{\sqrt{z_2^2-R^2\left(1+s_2^2\right)}}\right]
+\end{aligned}\right\} \text{some text}
+\end{align*}
+\end{document}