%%Created by jPicEdt 1.4pre4: mixed JPIC-XML/LaTeX format
%%Thu Sep 14 11:35:43 CEST 2006
%%Begin JPIC-XML
%<?xml version="1.0" standalone="yes"?>
%<jpic x-min="-3" x-max="83" y-min="0" y-max="60" auto-bounding="true">
%<multicurve points="(0,0);(0,0);(20,40);(20,40)"
%	
%	 fill-style="none"
%	 left-arrow="disk-centered" right-arrow="disk-centered" />
%<multicurve points="(0,0);(20,40);(60,60);(80,0)"
%	
%	 fill-style="none"
%	 />
%<multicurve points="(10,20);(10,20);(40,50);(40,50)"
%	
%	 fill-style="none"
%	 left-arrow="disk-centered" right-arrow="disk-centered" />
%<multicurve points="(40,50);(40,50);(70,30);(70,30)"
%	
%	 fill-style="none"
%	 left-arrow="disk-centered" right-arrow="disk-centered" />
%<multicurve points="(25,35);(25,35);(40,37.5);(40,37.5)"
%	
%	 fill-style="none"
%	 left-arrow="disk-centered" right-arrow="disk-centered" />
%<text text-vert-align="center-v" text-hor-align="right" anchor-point="(-3,0)" text-frame="noframe"
%	
%	 fill-style="none"
%	 >
%$A_0=B_0$
%</text>
%<text text-vert-align="center-v" text-hor-align="left" anchor-point="(83,0)" text-frame="noframe"
%	
%	 fill-style="none"
%	 >
%$A_3=C_3$
%</text>
%<text text-vert-align="center-v" text-hor-align="right" anchor-point="(18,41)" text-frame="noframe"
%	
%	 fill-style="none"
%	 >
%$A_1$
%</text>
%<text text-vert-align="center-v" text-hor-align="left" anchor-point="(63,59)" text-frame="noframe"
%	
%	 fill-style="none"
%	 >
%$A_2$
%</text>
%<text text-vert-align="center-v" text-hor-align="center-h" anchor-point="(40,52.5)" text-frame="noframe"
%	
%	 fill-style="none"
%	 >
%$M$
%</text>
%<text text-vert-align="center-v" text-hor-align="right" anchor-point="(8,21)" text-frame="noframe"
%	
%	 fill-style="none"
%	 >
%$B_1$
%</text>
%<text text-vert-align="center-v" text-hor-align="right" anchor-point="(24,36)" text-frame="noframe"
%	
%	 fill-style="none"
%	 >
%$B_2$
%</text>
%<text text-vert-align="center-v" text-hor-align="left" anchor-point="(57,41)" text-frame="noframe"
%	
%	 fill-style="none"
%	 >
%$C_1$
%</text>
%<text text-vert-align="center-v" text-hor-align="center-h" anchor-point="(42,34)" text-frame="noframe"
%	
%	 fill-style="none"
%	 >
%$B_3=C_0$
%</text>
%<text text-vert-align="center-v" text-hor-align="left" anchor-point="(73,30)" text-frame="noframe"
%	
%	 fill-style="none"
%	 >
%$C_2$
%</text>
%<text text-vert-align="center-v" text-hor-align="center-h" anchor-point="(55,32)" text-frame="noframe"
%	
%	 fill-style="none"
%	 >
%
%</text>
%<multicurve points="(40,37.5);(40,37.5);(55,40);(55,40)"
%	
%	 fill-style="none"
%	 left-arrow="disk-centered" right-arrow="disk-centered" />
%<multicurve points="(20,40);(20,40);(60,60);(60,60)"
%	
%	 fill-style="none"
%	 left-arrow="disk-centered" right-arrow="disk-centered" />
%<multicurve points="(60,60);(60,60);(80,0);(80,0)"
%	
%	 fill-style="none"
%	 left-arrow="disk-centered" right-arrow="disk-centered" />
%</jpic>
%%End JPIC-XML
%PsTricks content-type (pstricks.sty package needed)
%Add \usepackage{pstricks} in the preamble of your LaTeX file
%You can rescale the whole picture (to 80% for instance) by using the command \def\JPicScale{0.8}
\ifx\JPicScale\undefined\def\JPicScale{1}\fi
\psset{unit=\JPicScale mm}
\psset{linewidth=0.3,dotsep=1,hatchwidth=0.3,hatchsep=1.5,shadowsize=1}
\psset{dotsize=0.7 2.5,dotscale=1 1,fillcolor=black}
\psset{arrowsize=1 2,arrowlength=1,arrowinset=0.25,tbarsize=0.7 5,bracketlength=0.15,rbracketlength=0.15}
\begin{pspicture}(0,0)(83,60)
\psline{*-*}(0,0)(20,40)
\psbezier(0,0)(20,40)(60,60)(80,0)
\psline{*-*}(10,20)(40,50)
\psline{*-*}(40,50)(70,30)
\psline{*-*}(25,35)(40,37.5)
\rput[r](-3,0){$A_0=B_0$}
\rput[l](83,0){$A_3=C_3$}
\rput[r](18,41){$A_1$}
\rput[l](63,59){$A_2$}
\rput(40,52.5){$M$}
\rput[r](8,21){$B_1$}
\rput[r](24,36){$B_2$}
\rput[l](57,41){$C_1$}
\rput(42,34){$B_3=C_0$}
\rput[l](73,30){$C_2$}
\rput(55,32){}
\psline{*-*}(40,37.5)(55,40)
\psline{*-*}(20,40)(60,60)
\psline{*-*}(60,60)(80,0)
\end{pspicture}
