15
0.0 0.0
1.0 0.5
2.0 1.0
3.0 1.5
4.0 1.0
5.0 0.5
6.0 0.0
5.0 -0.5
4.0 -1.0
3.0 -1.5
2.0 -1.0
1.0 -0.5
-1.0 0.5
-2.0 0.0
-1.0 -0.5