%<TpX v="5" ArrowsSize="0.7" StarsSize="1" DefaultFontHeight="5" DefaultSymbolSize="30" ApproximationPrecision="0.01" PicScale="1" Border="2" BitmapRes="20000" HatchingStep="2" DottedSize="0.5" DashSize="1" LineWidth="0.3">
%  <circle x="79.7699" y="50.354" d="0"/>
%  <line x1="-50" y1="0" x2="50" y2="0" arr2="h40"/>
%  <line x1="-0.194669" y1="-65.9469" x2="0.230096" y2="-31.6106"/>
%  <arc x="0" y="-20" d="59.999" a1="2.41185" a2="7.01293"/>
%  <arc x="-0.194663" y="19.8053" d="59.9109" a1="3.87265" a2="5.57846"/>
%  <arc x="-0.371654" y="30.2478" d="0" a1="0" a2="0"/>
%  <arc x="0" y="30.0708" d="100.085" a1="3.78623" a2="5.63855"/>
%  <line x1="39.9823" y1="-0.0176914" x2="8.12392" y2="-9.22123"/>
%  <line x1="-40.5487" y1="0.1593" x2="-6.21236" y2="-9.9292"/>
%  <text x="0" y="-30.1062" t="I" h="3" halign="c"/>
%  <text x="0" y="-5.32743" t="II" h="3" halign="c"/>
%  <text x="-0.176991" y="-16.8319" t="III" h="3" halign="c"/>
%  <text x="-27.2743" y="-2.84955" t="IV" h="3" halign="c"/>
%  <text x="27.416" y="-2.49557" t="IV" h="3" halign="c"/>
%  <text x="52.0177" y="-1.43362" t="x" h="5" halign="c"/>
%  <line x1="0" y1="-26.1593" x2="0" y2="-18.0177"/>
%  <line x1="0" y1="-13.5929" x2="0" y2="-6"/>
%  <line x1="0" y1="14.3717" x2="0" y2="-2.08848" arr1="h40"/>
%  <text x="0" y="15.2567" t="y" h="5" halign="c"/>
%  <circle x="0" y="-20" d="1"/>
%</TpX>
\begin{figure}
\centering
\ifpdf
  \setlength{\unitlength}{1bp}%
  \begin{picture}(379.19, 341.01)(0,0)
  \put(0,0){\includegraphics{Fig2.pdf}}
  \put(147.40,107.27){\fontsize{8.54}{10.24}\selectfont \makebox[0pt]{I}}
  \put(147.40,177.50){\fontsize{8.54}{10.24}\selectfont \makebox[0pt]{II}}
  \put(146.90,144.89){\fontsize{8.54}{10.24}\selectfont \makebox[0pt]{III}}
  \put(70.09,184.53){\fontsize{8.54}{10.24}\selectfont \makebox[0pt]{IV}}
  \put(225.12,185.53){\fontsize{8.54}{10.24}\selectfont \makebox[0pt]{IV}}
  \put(294.85,188.54){\fontsize{14.23}{17.07}\selectfont \makebox[0pt]{x}}
  \put(147.40,235.85){\fontsize{14.23}{17.07}\selectfont \makebox[0pt]{y}}
  \end{picture}%
\else
  \setlength{\unitlength}{1bp}%
  \begin{picture}(379.19, 341.01)(0,0)
  \put(0,0){\includegraphics{Fig2}}
  \put(147.40,107.27){\fontsize{8.54}{10.24}\selectfont \makebox[0pt]{I}}
  \put(147.40,177.50){\fontsize{8.54}{10.24}\selectfont \makebox[0pt]{II}}
  \put(146.90,144.89){\fontsize{8.54}{10.24}\selectfont \makebox[0pt]{III}}
  \put(70.09,184.53){\fontsize{8.54}{10.24}\selectfont \makebox[0pt]{IV}}
  \put(225.12,185.53){\fontsize{8.54}{10.24}\selectfont \makebox[0pt]{IV}}
  \put(294.85,188.54){\fontsize{14.23}{17.07}\selectfont \makebox[0pt]{x}}
  \put(147.40,235.85){\fontsize{14.23}{17.07}\selectfont \makebox[0pt]{y}}
  \end{picture}%
\fi
\end{figure}