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Dalitz plot expansion coeff:
|A(x,y)|^2/|A(0,0)|^2 = 1 + a*y + b*y^2 + c*x + d*x^2 + e*x*y + f*y^3.
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a = -1.11211 +/- 0.0420476
b = 0.300892 +/- 0.00355442
c = 0 +/- 1.48428e-11
d = 0.0347682 +/- 0.000552329
e = -2.76158e-13 +/- 0
f = 0.0448402 +/- 0.00486139