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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 = -1.12278 +/- 0.0261906
b = 0.228779 +/- 0.00992218
c = 0 +/- 5.11354e-10
d = 0.095869 +/- 0.00270668
e = 2.7515e-13 +/- 6.72302e-09
f = 0.0702775 +/- 0.00344101