ex4-5.tex
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	\documentclass[tikz,convert={outfile=\jobname.svg}]{standalone}
	\usepackage{pgfplots}
	\usetikzlibrary{calc,patterns,snakes}
	% \usetikzlibrary{...}% tikz package already loaded by 'tikz' option
	\begin{document}
	\begin{tikzpicture}[scale=0.8]
	\begin{axis}[xlabel=x (mm), ylabel=$\sigma$ (MPa),
	xmin=0,ymin=-2,xmax=2,ymax=2]
	\addplot [thick,dashed,color=black, mark=none] coordinates { (0,1) (1,1) (1,-1) (2,-1) };
	\addlegendentry{Approximation};
	\addplot[thick,color=red, mark=none] coordinates { (0,1) (1,1) (1,-1) (2,-1) };
	\addlegendentry{Exact};
	\end{axis}
	\end{tikzpicture}
	\end{document}