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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 = -1.07227 +/- 0.0335823
b = 0.293291 +/- 0.00491155
c = 0 +/- 0
d = 0.0934312 +/- 0.0022407
e = -2.78168e-13 +/- 0
f = 0.0157486 +/- 0.00388019