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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 = -1.11892 +/- 0.0298527
b = 0.205346 +/- 0.00924394
c = 2.19533e-14 +/- 1.63442e-11
d = 0.0951306 +/- 0.00230581
e = -1.09767e-12 +/- 1.36299e-09
f = 0.085393 +/- 0.00377246