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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 = -1.12808 +/- 0.0184083
b = 0.218691 +/- 0.0250615
c = 2.20012e-14 +/- 1.4839e-09
d = 0.0957797 +/- 0.00554719
e = -1.37508e-12 +/- 3.66696e-07
f = 0.0880535 +/- 0.00423176