{"coeffs": [-0.20062761263846457, 1.2275775846493839e-07, 0.4250854853312451, 0.0027317441620373683], "function": "lambda x, A, B, C, D: (D + ((C - D) / (1 + numpy.exp((B - x) / A))))", "log_ftol": 1e-08, "errors": [NaN, 1.8096520250852787e-07, 85258.53003264224, NaN], "covariance": [[-84554458165429.69, -1.0331455249193987e-07, 251603016160.58173, -119742885830.14177], [2.466960030915168e-08, 3.27484045189525e-14, -9.409283912610903e-11, 4.388348029330488e-11], [0.0, -4.0357247067164013e-10, 7269016943.326961, -598435531.1794367], [-99029192933.79636, 0.0, -303761019.9745584, -90974134.13572755]]}