\input{preamble-standalone.ltx} \begin{document} % Ex. No. 100 (Section 14.3.1 : Ligne verticale ) \begin{tikzpicture}[scale=2] \tkzInit[xmax=3,ymax=1] \tkzAxeXY \tkzVLine[color = blue, style = dashed, line width = 2pt]{1/3} \end{tikzpicture} \end{document}