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+%%
+%% An UIT Edition example
+%%
+%% Example 09-17-4 on page 187.
+%%
+%% 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}}
+\usepackage[ngerman]{babel}
+\setcounter{equation}{22}
+\renewcommand\theequation{9.\arabic{equation}}
+\StartShownPreambleCommands
+\usepackage{mathtools}
+\newtagform{angels}{<}{>}
+\StopShownPreambleCommands
+\begin{document}
+\mathtoolsset{showonlyrefs,showmanualtags}
+\usetagform{angels}
+\begin{gather}
+ a = a \label{eq:a}\\
+ b = b\label{eq:b}\tag{**}
+\end{gather}
+\mathtoolsset{showmanualtags=false}
+A reference to Equation~\refeq{eq:a} (a).
+\usetagform{default}% change the labeling
+\begin{align}
+ c &= c \label{eq:c}\\
+ d &= d\label{eq:d}\tag{!!}
+\end{align}
+A reference to Equation~\refeq{eq:e} (e).
+Label (!!) is not shown now!
+\begin{align} e = e \label{eq:e}\end{align}
+Reset the default.
+\mathtoolsset{showonlyrefs=false}
+\begin{align} f = f \label{eq:f}\end{align}
+\end{document}