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Hello,

The TikZ session in TeXmacs work well with a script like

\uselibrary{...}
\begin{tikzpicture}
...
\end{tikzpicture}

but the use of additional packages, like

\usepackage{3dplots}
\begin{tikzpicture}
...
\end{tikzpicture}

gives an error message "\usepackage can olny be used in the preamble".

Does anybody know how to include \usepackage in the preamble (or the exact
location of the preamble...) or how to overcome this issue ?

Best wishes,

Alexandre