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\usepackage{amsmath, array, amssymb, xcolor, tikz}
\begin{document}
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\draw (16.37,66.4) node [anchor=north west][inner sep=0.75pt] [font=\footnotesize] {$f( \rho )$};
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blue, 224 } ,opacity=1 ] {$\rho _{L}$};
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blue, 239 } ,opacity=1 ] {$\rho _{R}$};
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green, 13;
blue, 239 } ,opacity=1 ] {$\rho _{M}$};
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green, 13;
blue, 239 } ,opacity=1 ,rotate=-288.5,xslant=-0.08] {$\textcolor[rgb]{0.82,0.01,0.11}{\alpha >v}\textcolor[rgb]{0.82,0.01,0.11}{(}\textcolor[rgb]{0.82,0.01,0.11}{\rho }\textcolor[rgb]{0.82,0.01,0.11}{_{R}}\textcolor[rgb]{0.82,0.01,0.11}{)}$};
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blue, 224 } ,opacity=1 ] {$\rho _{R}$};
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green, 13;
blue, 239 } ,opacity=1 ] {$\rho _{M}$};
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green, 13;
blue, 239 } ,opacity=1 ] {$\rho _{L}$};
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green, 13;
blue, 239 } ,opacity=1 ,rotate=-71.57,xslant=-0.08] {$\textcolor[rgb]{0.82,0.01,0.11}{\alpha < -v}\textcolor[rgb]{0.82,0.01,0.11}{(}\textcolor[rgb]{0.82,0.01,0.11}{\rho }\textcolor[rgb]{0.82,0.01,0.11}{_{L}}\textcolor[rgb]{0.82,0.01,0.11}{)}$};
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\end{document}