#FIG 3.2  Produced by xfig version 3.2.5
Landscape
Center
Metric
A4      
100.00
Single
-2
1200 2
6 -90 -225 270 0
2 2 0 1 -1 7 45 -1 -1 3.000 0 0 -1 0 0 5
	 0 -225 225 -225 225 0 0 0 0 -225
4 1 -1 40 -1 0 12 0.0000 6 180 330 90 -45 $S$\001
-6
2 2 0 1 0 7 40 -1 20 0.000 0 0 -1 0 0 5
	 225 225 675 225 675 675 225 675 225 225
2 2 0 1 0 7 40 -1 20 0.000 0 0 -1 0 0 5
	 1350 1125 1800 1125 1800 1575 1350 1575 1350 1125
2 3 0 0 -1 7 45 -1 20 1.500 0 0 -1 0 0 6
	 765 720 675 810 1170 1035 1260 945 810 765 765 720
2 1 1 2 0 7 40 -1 20 2.000 0 0 -1 0 0 2
	 810 810 1215 990
2 2 0 1 0 7 50 -1 45 0.000 0 0 -1 0 0 5
	 0 0 2025 0 2025 1800 0 1800 0 0
2 2 0 0 -1 7 45 -1 20 0.000 0 0 -1 0 0 5
	 135 1485 360 1485 360 1710 135 1710 135 1485
4 1 -1 35 -1 0 12 0.0000 6 210 540 450 540 $S_1$\001
4 1 -1 35 -1 0 12 0.0000 6 210 540 1575 1440 $S_n$\001
4 1 -1 40 -1 0 12 0.0000 6 180 375 225 1665 $S'$\001