diff -r 7c4ba7daaf5f -r 2b6bffe0e7e8 doc/images/matching.eps
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/doc/images/matching.eps	Tue Dec 20 18:15:14 2011 +0100
@@ -0,0 +1,130 @@
+%!PS-Adobe-2.0 EPSF-2.0
+%%Creator: LEMON, graphToEps()
+%%CreationDate: Sun Mar 14 09:08:34 2010
+%%BoundingBox: -353 -264 559 292
+%%EndComments
+/lb { setlinewidth setrgbcolor newpath moveto
+      4 2 roll 1 index 1 index curveto stroke } bind def
+/l { setlinewidth setrgbcolor newpath moveto lineto stroke } bind def
+/c { newpath dup 3 index add 2 index moveto 0 360 arc closepath } bind def
+/sq { newpath 2 index 1 index add 2 index 2 index add moveto
+      2 index 1 index sub 2 index 2 index add lineto
+      2 index 1 index sub 2 index 2 index sub lineto
+      2 index 1 index add 2 index 2 index sub lineto
+      closepath pop pop pop} bind def
+/di { newpath 2 index 1 index add 2 index moveto
+      2 index             2 index 2 index add lineto
+      2 index 1 index sub 2 index             lineto
+      2 index             2 index 2 index sub lineto
+      closepath pop pop pop} bind def
+/nc { 0 0 0 setrgbcolor 5 index 5 index 5 index c fill
+     setrgbcolor 1.1 div c fill
+   } bind def
+/nsq { 0 0 0 setrgbcolor 5 index 5 index 5 index sq fill
+     setrgbcolor 1.1 div sq fill
+   } bind def
+/ndi { 0 0 0 setrgbcolor 5 index 5 index 5 index di fill
+     setrgbcolor 1.1 div di fill
+   } bind def
+/nfemale { 0 0 0 setrgbcolor 3 index 0.0909091 1.5 mul mul setlinewidth
+  newpath 5 index 5 index moveto 5 index 5 index 5 index 3.01 mul sub
+  lineto 5 index 4 index .7 mul sub 5 index 5 index 2.2 mul sub moveto
+  5 index 4 index .7 mul add 5 index 5 index 2.2 mul sub lineto stroke
+  5 index 5 index 5 index c fill
+  setrgbcolor 1.1 div c fill
+  } bind def
+/nmale {
+  0 0 0 setrgbcolor 3 index 0.0909091 1.5 mul mul setlinewidth
+  newpath 5 index 5 index moveto
+  5 index 4 index 1 mul 1.5 mul add
+  5 index 5 index 3 sqrt 1.5 mul mul add
+  1 index 1 index lineto
+  1 index 1 index 7 index sub moveto
+  1 index 1 index lineto
+  exch 5 index 3 sqrt .5 mul mul sub exch 5 index .5 mul sub lineto
+  stroke
+  5 index 5 index 5 index c fill
+  setrgbcolor 1.1 div c fill
+  } bind def
+/arrl 1 def
+/arrw 0.3 def
+/lrl { 2 index mul exch 2 index mul exch rlineto pop} bind def
+/arr { setrgbcolor /y1 exch def /x1 exch def /dy exch def /dx exch def
+       /w exch def /len exch def
+       newpath x1 dy w 2 div mul add y1 dx w 2 div mul sub moveto
+       len w sub arrl sub dx dy lrl
+       arrw dy dx neg lrl
+       dx arrl w add mul dy w 2 div arrw add mul sub
+       dy arrl w add mul dx w 2 div arrw add mul add rlineto
+       dx arrl w add mul neg dy w 2 div arrw add mul sub
+       dy arrl w add mul neg dx w 2 div arrw add mul add rlineto
+       arrw dy dx neg lrl
+       len w sub arrl sub neg dx dy lrl
+       closepath fill } bind def
+/cshow { 2 index 2 index moveto dup stringwidth pop
+         neg 2 div fosi .35 mul neg rmoveto show pop pop} def
+
+gsave
+%Arcs:
+gsave
+140.321 266.249 -327.729 150.06 0 0 0 4.99223 l
+82.1207 -238.726 -245.288 -110.743 0 0 0 4.99223 l
+336.635 -229.036 533.603 13.109 0 0 0 4.99223 l
+53.8598 -45.8071 -245.288 -110.743 0 0 0 4.99223 l
+-75.5617 118.579 -327.729 150.06 0 0 0 4.99223 l
+-327.729 150.06 -245.288 -110.743 1 0 0 11.9813 l
+533.603 13.109 218.184 -84.2955 0 0 0 4.99223 l
+39.87 175.035 141.163 67.2575 0 0 0 4.99223 l
+53.8598 -45.8071 -75.5617 118.579 0 0 0 4.99223 l
+-102.406 -141.267 82.1207 -238.726 0 0 0 4.99223 l
+399.144 166.894 533.603 13.109 1 0 0 11.9813 l
+39.87 175.035 140.321 266.249 1 0 0 11.9813 l
+399.144 166.894 140.321 266.249 0 0 0 4.99223 l
+399.144 166.894 141.163 67.2575 0 0 0 4.99223 l
+53.8598 -45.8071 204.765 -173.77 0 0 0 4.99223 l
+82.1207 -238.726 204.765 -173.77 0 0 0 4.99223 l
+258.227 61.658 399.144 166.894 0 0 0 4.99223 l
+53.8598 -45.8071 -102.406 -141.267 1 0 0 11.9813 l
+175.073 -37.4477 141.163 67.2575 0 0 0 4.99223 l
+258.227 61.658 380 0 0 0 0 4.99223 l
+34.6739 40.8267 -75.5617 118.579 1 0 0 11.9813 l
+380 0 533.603 13.109 0 0 0 4.99223 l
+175.073 -37.4477 380 0 0 0 0 4.99223 l
+218.184 -84.2955 204.765 -173.77 0 0 0 4.99223 l
+53.8598 -45.8071 34.6739 40.8267 0 0 0 4.99223 l
+167.905 -213.988 82.1207 -238.726 1 0 0 11.9813 l
+336.635 -229.036 204.765 -173.77 1 0 0 11.9813 l
+336.635 -229.036 167.905 -213.988 0 0 0 4.99223 l
+329.08 -26.3098 218.184 -84.2955 0 0 0 4.99223 l
+39.87 175.035 -75.5617 118.579 0 0 0 4.99223 l
+53.8598 -45.8071 175.073 -37.4477 0 0 0 4.99223 l
+34.6739 40.8267 141.163 67.2575 0 0 0 4.99223 l
+258.227 61.658 141.163 67.2575 1 0 0 11.9813 l
+175.073 -37.4477 218.184 -84.2955 1 0 0 11.9813 l
+380 0 329.08 -26.3098 1 0 0 11.9813 l
+grestore
+%Nodes:
+gsave
+-245.288 -110.743 14.9767 1 1 1 nc
+204.765 -173.77 14.9767 1 1 1 nc
+-327.729 150.06 14.9767 1 1 1 nc
+-75.5617 118.579 14.9767 1 1 1 nc
+218.184 -84.2955 14.9767 1 1 1 nc
+140.321 266.249 14.9767 1 1 1 nc
+141.163 67.2575 14.9767 1 1 1 nc
+82.1207 -238.726 14.9767 1 1 1 nc
+329.08 -26.3098 14.9767 1 1 1 nc
+-102.406 -141.267 14.9767 1 1 1 nc
+533.603 13.109 14.9767 1 1 1 nc
+167.905 -213.988 14.9767 1 1 1 nc
+336.635 -229.036 14.9767 1 1 1 nc
+380 0 14.9767 1 1 1 nc
+399.144 166.894 14.9767 1 1 1 nc
+34.6739 40.8267 14.9767 1 1 1 nc
+39.87 175.035 14.9767 1 1 1 nc
+175.073 -37.4477 14.9767 1 1 1 nc
+53.8598 -45.8071 14.9767 1 1 1 nc
+258.227 61.658 14.9767 1 1 1 nc
+grestore
+grestore
+showpage