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+<code latex>
+\documentclass{article}
+\usepackage[pdftex,active,tightpage]{preview}
+\usepackage{tikz}
+\PreviewEnvironment{tikzpicture}
+\begin{document}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\begin{tikzpicture}
+	\draw (0,0) circle (1);
+	\draw [fill=lightgray] (0,0) circle (0.75);
+	\draw [fill=gray] (0,0) circle (0.5);
+	%\draw [fill=darkgray] (0,0) circle (0.25);
+	%\draw [ultra thick,red] (0,0) circle (0.025);
+	\draw [red,thick,->] (0,0)  -- (1,0)		node at (1,0)	[black,right] {1};
+	\draw [red,thick,->] (0,0)  -- (0,0.75)	node at (0,1)	[black,above] {0.75};
+	%\draw [red,thick,->] (0,0)  -- (-0.5,0)	node at (-1,0)	[black,left] {0.5};
+	%\draw [red,thick,->] (0,0)  -- (0,-0.25)	node at (0,-1)	[black,below] {0.25};
+\end{tikzpicture}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\end{document}
+</code>