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\documentclass{standalone}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
\draw(-3,0)--(3,0);
\draw(0,-1.5)--(0,3);
\draw[color=gray,line width=1pt, densely dotted](-2.5,1.25)--++(2.5,0);
\draw[color=gray,line width=1pt, densely dotted](-1,2.00)--++(1,0);
\draw[color=gray,line width=1pt, densely dotted](-1,2.75)--++(3.5,0);
\draw[->,line width=0.75pt,color=red](-0.5,1.25)--++(0,0.75);
\draw[->,line width=0.75pt,color=red](-0.5,2.00)--++(0,0.75);
\draw[line width=1.5pt](-2.5,0)--(0,0)--(0,2.5)--(2.5,2.5);
\end{tikzpicture}
\end{document}
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