# siunitx alsoload option high energy physics

Until now (before release 2013/07/31) it was possible to use the option alsoload=hep.

\usepackage[alsoload=hep]{siunitx}


Actually I do not see how it should be possible to load the \gauss unit (from high energy physics) in the new release.

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(If you need a quick solution, load the option version-1-compatibility;

\usepackage[version-1-compatibility]{siunitx}


However, since the new version of siunitx, the following is more appropriate:)

Just declare the unit by yourself as described on page 39 in the manual.

\documentclass{article}
\usepackage{siunitx}
\DeclareSIUnit\gauss{G}

\begin{document}
$\SI{3}{\gauss}$
\end{document}


The loadable special units are not longer available: see the manual for an explanation of why.

Edit

To provide all the hep functionality you may type:

% High energy physics
\DeclareSIUnit\micron{\micro\metre}
\DeclareSIUnit\gauss{G}
\DeclareSIUnit\eVperc{\eV\per\clight}
\DeclareSIUnit\nanobarn{\nano\barn}
\DeclareSIUnit\picobarn{\pico\barn}
\DeclareSIUnit\femtobarn{\femto\barn}
\DeclareSIUnit\attobarn{\atto\barn}
\DeclareSIUnit\zeptobarn{\zepto\barn}
\DeclareSIUnit\yoctobarn{\yocto\barn}
\DeclareSIUnit\nb{\nano\barn}
\DeclareSIUnit\pb{\pico\barn}
\DeclareSIUnit\fb{\femto\barn}
\DeclareSIUnit\ab{\atto\barn}
\DeclareSIUnit\zb{\zepto\barn}
\DeclareSIUnit\yb{\yocto\barn}

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You may also declare those in a file siunitx.cfg and load it before \sisetup. With \ProvidesFile{siunitx.cfg} you'll have your own settings always available. –  LaRiFaRi Aug 5 '13 at 18:10