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%%
%% The LaTeX Companion, 3ed
%%
%% Example 3-2-8 on page I-152 in "underscore --- Making that character more usable".
%%
%% 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{183.0pt}

%StartShownPreambleCommands
 \usepackage{underscore}
 \newcommand\var[1]{\textsf{\itshape #1}}
%StopShownPreambleCommands

\begin{document}
 We have $\var{temperature_cur_value} < x_i$
 even if \var{temperature_max} has not been set.
\end{document}