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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 = -1.11005 +/- 0.0345832
b = 0.281025 +/- 0.00571635
c = 0 +/- 0
d = 0.00310532 +/- 5.81597e-06
e = -5.47689e-13 +/- 0
f = 0.0379255 +/- 0.00420748