{"coeffs": [-1.9246295401842417e-07, -5.507985924853633e-09, -0.3099923738897789, 0.0003380675281481122], "function": "lambda x, A, B, C, D: (D + ((C - D) / (1 + numpy.exp((B - x) / A))))", "log_ftol": 1e-08, "errors": [4.268077977409718e-08, 2.6136532931113892e-08, NaN, NaN], "covariance": [[1.821648962124983e-15, 0.0, -0.0, 0.0], [0.0, 6.831183536592009e-16, -0.0, 3.5427654703234793e-05], [0.0, 0.0030043863033581016, -2.2754192591941935e+26, 7.438500196815176e+24], [0.0, 0.0, 7.438500196815173e+24, -2.4316962667185186e+23]]}