{"coeffs": [-3.340409904240006e-07, 4.346016654194241e-09, -0.29360484152147864, 0.0015214493804064908], "function": "lambda x, A, B, C, D: (D + ((C - D) / (1 + numpy.exp((B - x) / A))))", "log_ftol": 1e-08, "errors": [2.8580965729251823e-08, 1.7502194689974198e-08, NaN, NaN], "covariance": [[8.168716020166673e-16, -2.550683420767646e-32, 1.4679847136098078e-11, -2.0075436491074042e-11], [-1.7004556138450975e-32, 3.0632681896576107e-16, 1.5543513606362367e-11, -2.5094295613842553e-11], [1.505657736830553e-11, 1.2547147806921277e-11, -6120357549.208825, 12043999913.205425], [-2.0075436491074042e-11, -2.0075436491074042e-11, 12043999913.205425, -23700892103.606564]]}