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I want to add an arbitrary length to an axis, but I don't know how.
\documentclass[10pt,a4paper,french]{article}
\usepackage{tikz}
\pgfkeys{/tikz/.cd,
NbGrad/.store in=\NbGrad,
Noze/.store in=\Noze,
Noze=.5cm,
}
\begin{document}
\begin{tikzpicture}[%
>=stealth,x=6cm,font=\footnot...