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Minimizer is Minuit2 / Migrad
Chi2                      =      993.065
NDf                       =          997
Edm                       =  2.24084e-24
NCalls                    =            7
p0                        =     0.993546   +/-   0.00475134  
p1                        =      0.99397   +/-   0.00434249  
p2                        =     0.997895   +/-   0.000545663 
Good fit : p-value  = 0.529221