--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pnas/diagrams/tikz-figures.tex	Mon Dec 06 11:57:19 2010 -0600
@@ -0,0 +1,44 @@
+\documentclass{amsart}
+
+\usepackage{tikz}
+\pgfrealjobname{tikz-figures}
+
+\begin{document}
+
+\begin{figure}
+\centering
+\beginpgfgraphicnamed{figure1}%
+\begin{tikzpicture}[%every label/.style={green}
+]
+\node[fill=black, circle, label=below:$E$, inner sep=1.5pt](S) at (0,0) {};
+\node[fill=black, circle, label=above:$E$, inner sep=1.5pt](N) at (0,2) {};
+\draw (S) arc  (-90:90:1);
+\draw (N) arc  (90:270:1);
+\node[left] at (-1,1) {$B_1$};
+\node[right] at (1,1) {$B_2$};
+\end{tikzpicture}
+\endpgfgraphicnamed%
+\mbox{} % <-- weird, doesn't compile unless I put something here after the \endpgfgraphicnamed...? -S
+\caption{Combining two balls to get a full boundary.}\label{blah3}\end{figure}
+
+\begin{figure}
+\centering
+\beginpgfgraphicnamed{figure2}%
+\begin{tikzpicture}[%every label/.style={green},
+				x=1.5cm,y=1.5cm]
+\node[fill=black, circle, label=below:$E$, inner sep=2pt](S) at (0,0) {};
+\node[fill=black, circle, label=above:$E$, inner sep=2pt](N) at (0,2) {};
+\draw (S) arc  (-90:90:1);
+\draw (N) arc  (90:270:1);
+\draw (N) -- (S);
+\node[left] at (-1/4,1) {$B_1$};
+\node[right] at (1/4,1) {$B_2$};
+\node at (1/6,3/2)  {$Y$};
+\end{tikzpicture}
+\endpgfgraphicnamed%
+\mbox{} % <-- weird, doesn't compile unless I put something here after the \endpgfgraphicnamed...? -S
+\caption{From two balls to one ball.}\label{blah5}\end{figure}
+
+
+\end{document}
+