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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 = -1.12363 +/- 0.0347652
b = 0.302568 +/- 0.00533901
c = 0 +/- 0
d = 0.0985335 +/- 0.00236817
e = -2.79164e-13 +/- 1.74477e-14
f = 0.0262134 +/- 0.00415786