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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 = -1.11683 +/- 0.0350086
b = 0.199374 +/- 0.00651368
c = 2.18695e-14 +/- 7.92459e-11
d = 0.0736744 +/- 0.00249154
e = 0 +/- 6.06452e-10
f = 0.079501 +/- 0.00306501