x,y
0.5,-0.5
1.0,-1.0
1.5,-1.5
2.0,-2.0
2.5,-2.5
3.0,-3.0
3.5,-3.5
4.0,-4.0
4.5,-4.5
5.0,-5.0
5.5,-5.5
6.0,-6.0
6.5,-6.5
7.0,-7.0
7.5,-7.5
8.0,-8.0
8.5,-8.5
9.0,-9.0
9.5,-9.5
10.0,-10.0