-15	58.4
-7.5001	58.4
-7.5	46.4
-2.5	46.4
-2.4999	0
2.4999	0
2.5	46.4
5.5 	46.4 
7.5	73.1
7.5001	85.1
11.5	138.4
12.5	138.4
12.5001	163.4
15	163.4