aaa,,bbb,,ccc,,ddd,
x,y,x,y,x,y,x,y
2,4,2.3,12,2,1,2,0.5
3,6,3.4,15,3,2,3,0.8
4,8,4.5,18,4,3,4,1.2
5,12,5.2,22,5,4,5,2.4
6,15,6.5,26,6,9,6,3.7
7,18,7.2,30,7,11,7,6.7
8,22,8.9,35,8,15,8,8.9
9,23,9.2,37,9,19,9,10.2
