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@@ -0,0 +1,33 @@
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+\documentclass[varwidth=true, border=2pt]{standalone}
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+
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+\usepackage{pgfplots}
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+\usepackage{tikz}
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+\usepackage{tkz-fct}
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+\usetikzlibrary{shapes.misc}
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+
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+\begin{document}
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+\begin{tikzpicture}
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+ \tikzstyle{point}=[thick,draw=black,cross out,inner sep=0pt,minimum width=4pt,minimum height=4pt]
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+ \begin{axis}[
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+ legend pos=south west,
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+ axis x line=middle,
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+ axis y line=middle,
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+ grid = major,
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+ width=5cm,
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+ height=5cm,
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+ grid style={dashed, gray!30},
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+ xmin=0, % start the diagram at this x-coordinate
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+ xmax=3, % end the diagram at this x-coordinate
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+ ymin=0, % start the diagram at this y-coordinate
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+ ymax=3, % end the diagram at this y-coordinate
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+ tick align=outside,
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+ minor tick num=-3,
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+ enlargelimits=true,
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+ tension=0.08]
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+ \node (a)[point,label={[label distance=0cm]5:$e_0$}] at (axis cs:2.5,0) {};
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+ \node (b)[point,label={[label distance=0cm]5:$e_1$}] at (axis cs:0,2.5) {};
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+ \node (c)[point,label={[label distance=0cm]0:$e_2$}] at (axis cs:2,2) {};
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+ \draw[thick,fill=orange!50] (a.center) -- (b.center) -- (c.center) -- cycle;
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+ \end{axis}
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+\end{tikzpicture}
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+\end{document}
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