% Generated with LaTeXDraw 2.0.8
% Tue Apr 05 20:34:59 EDT 2011
% \usepackage[usenames,dvipsnames]{pstricks}
% \usepackage{epsfig}
% \usepackage{pst-grad} % For gradients
% \usepackage{pst-plot} % For axes
\scalebox{1.5} % Change this value to rescale the drawing.
{
\begin{pspicture}(0,-0.49453124)(1.76,0.51453125)
\psline[linewidth=0.04cm,arrowsize=0.05291667cm 2.0,arrowlength=1.4,arrowinset=0.4]{->}(0.08,-0.39453125)(0.68,0.20546874)
\psline[linewidth=0.04cm,arrowsize=0.05291667cm 2.0,arrowlength=1.4,arrowinset=0.4]{<-}(1.08,0.20546874)(1.66,-0.39453125)
\psdots[dotsize=0.12,fillstyle=solid,dotstyle=o](0.68,0.20546874)
\psdots[dotsize=0.12,fillstyle=solid,dotstyle=o](1.08,0.20546874)
\psdots[dotsize=0.12](0.06,-0.39453125)
\psdots[dotsize=0.12](1.68,-0.41453126)
\usefont{OT1}{ptm}{m}{n}
\rput(0.66046876,0.43046874){\scriptsize o}
\usefont{OT1}{ptm}{m}{n}
\rput(0.85375,0.19046874){\scriptsize +}
\usefont{OT1}{ptm}{m}{n}
\rput(1.0604688,0.43046874){\scriptsize o}
\usefont{OT1}{ptm}{m}{n}
\rput(0.22125,0.01046875){\scriptsize 2}
\usefont{OT1}{ptm}{m}{n}
\rput(1.52125,0.01046875){\scriptsize 2}
\end{pspicture}
}
