{"coeffs": [-1.1017822352243912e-07, -3.744752625636619e-09, -0.3330999315021239, 0.00019935579960999304], "function": "lambda x, A, B, C, D: (D + ((C - D) / (1 + numpy.exp((B - x) / A))))", "log_ftol": 1e-08, "errors": [1.5342576251804152e-08, 8.320679527334585e-09, NaN, NaN], "covariance": [[2.353946460424248e-16, 5.104307765508637e-34, 6.02610297752231e-13, -1.6196661730430824e-13], [1.0208615531017273e-33, 6.92337077966049e-17, -0.0, 3.2565624622960334e-13], [4.519577233141732e-13, 0.0, -153775257.5386167, 118572778.01405135], [-1.5065257443805774e-13, 3.013051488761155e-13, 118572778.01405135, -91428906.77610351]]}