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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 = -0.885291 +/- 0.0237768
b = 0.156435 +/- 0.0070346
c = 0 +/- 0
d = 0 +/- 0
e = 0 +/- 1.67666e-14
f = 0.0352979 +/- 0.0023807