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Pearson0004.pgf

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+\begin{tikzpicture}
+\usetikzlibrary{plotmarks}
+\draw[color=gray, thin] (-3,0) -- (3,0);
+%http://tex.stackexchange.com/questions/64567/how-to-draw-circle-square-and-triangle-marks-in-tikz-picture
+
+\draw[color=blue!50, ultra thick] (-1.4625,0) -- (1.4625,0);
+%\node[mark size=2.5pt,color=blue!50, fill=none] at (-1.5,0) {\pgfuseplotmark{*}};
+%\node[mark size=2.5pt,color=blue!50] at (1.5,0) {\pgfuseplotmark{*}};
+
+\draw[color=blue!50, ultra thick] (-1.5, 0) circle (.075);
+\draw[fill=blue!50,color=blue!50, ultra thick] (1.5, 0) circle (.075);
+\node[color=blue!50] at (-1.5,0.35) {\textbf{a}};
+\node[color=blue!50] at (1.5,0.35) {\textbf{b}};
+\end{tikzpicture}