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+<code latex>
+\documentclass{article}
+\usepackage[pdftex,active,tightpage]{preview}
+\usepackage{tikz}
+	\usetikzlibrary{patterns}
+\PreviewEnvironment{tikzpicture}
+\begin{document}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\def\radius{1}
+\def\ticklength{.3}
+\def\labelshift{0.35}
+\def\overlap{.075}
+\def\projangle{17}
+\def\angleshift{2}
+\begin{tikzpicture}[scale=1.6]
+	\scriptsize
+	%% Fill CenterScan
+		\pattern [pattern=checkerboard light gray] (1,0) -- (3,0) arc (0:180:3*\radius) -- (-1,0) arc (180:0:\radius);
+		\fill [color=red,nearly transparent] (1,0) -- (3,0) arc (0:180:3*\radius) -- (-1+\overlap,0) arc (180:0:\radius-\overlap);
+	%% Fill RingScan 1
+		\fill [color=green,nearly transparent] (0,0) circle (\radius+\overlap);
+	%% Fill RingScan 2
+		\pattern [pattern=horizontal lines gray] (1,0) -- (3,0) arc (0:-180:3*\radius) -- (-1,0) arc (-180:0:\radius);
+		\fill [color=blue,nearly transparent] (1,0) -- (3,0) arc (0:-180:3*\radius) -- (-1+\overlap,0) arc (-180:0:\radius-\overlap);
+	%% Projections
+		\draw [ultra thick,color=red](\projangle:\radius-\overlap) -- (\projangle:3*\radius);
+		\draw [ultra thick,color=green](\projangle+180+\angleshift:\radius+\overlap) -- (\projangle+\angleshift:\radius+\overlap);
+		\draw [ultra thick,color=blue](\projangle+180:3*\radius) -- (\projangle+180:\radius-\overlap);
+	%% inner ring
+		% ring
+			\draw (0,0) circle (\radius);
+		% projections
+			\foreach \angle in {0,20,...,181}
+				\draw (\angle:-\radius) -- (\angle:\radius+\ticklength);
+			\foreach \angle in 	{0,5,...,179}
+			{
+		% inner ticks
+				\draw (\angle:-.5*\ticklength) -- (\angle:.5*\ticklength);
+%		% median ticks
+%				\draw [dotted] (\angle:.5*\ticklength) -- (\angle:\radius-.5*\ticklength);
+%				\draw [dotted] (180+\angle:.5*\ticklength) -- (180+\angle:\radius);
+		% outer ticks
+				\draw (\angle:\radius-.5*\ticklength) -- (\angle:\radius);
+			}
+		% labels
+			\foreach \angle / \label in {0/1,30/200,60/500,90/750,120/1000,150/1250,180/1500}
+		 		\draw (\angle:\radius-\labelshift) node {\label}; % {\textsf{\label}};
+	%% outer ring
+		% circle
+			\draw (0,0) circle (3*\radius);
+		% projections
+			\foreach \angle in {0,20,...,719}
+				\draw (.5*\angle:\radius) -- (.5*\angle:3*\radius+\ticklength);
+			\foreach \angle in 	{0,2.5,...,359}
+			{
+		% inner ticks
+				\draw (\angle:3*\radius-.5*\ticklength) -- (\angle:3*\radius+.5*\ticklength);
+%		% median ticks
+%				\draw [dotted] (\angle:\radius+.5*\ticklength) -- (\angle:3*\radius-.5*\ticklength);
+		% outer ticks
+				\draw (\angle:\radius) -- (\angle:\radius+.5*\ticklength);
+			}
+		% labels
+			\foreach \angle / \label in {2/1 and,15/200,30/500,45/750,60/1000,75/1250,90/1500,105/1750,120/2000,135/2250,150/2500,165/2750,178/3000}
+			 	\draw (\angle:3*\radius+\labelshift) node {\label};
+			\foreach \angle / \label in {2/and 1,15/200,30/500,45/750,60/1000,75/1250,90/1500,105/1750,120/2000,135/2250,150/2500,165/2750,178/3000}
+			 		\draw (180+\angle:3*\radius+\labelshift) node {\label};
+	\end{tikzpicture}%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\end{document}
+</code>