A = (1, 1)
B = (2, 3)
C = (3, 5)
D = (4, 7)
E = (5, 9)
F = (6, 11)
G = (7, 13)
H = (8, 8)
I = (9, 6)
f = FitPoly({A, B, C, D, E, F, G, H, I}, 8)