v -5   0.4  0
v -4   0.4  0
v -3   0.4  0.7
v -2.5 0.4  2
v -2   0.4  2
v -1   0.4  0.7
v -0.6 0.4  0
v 10   0.4  0
l 1 2 3 4 5 6 7 8