{"coeffs": [-5.323031609854327e-06, 2.7818155956586535e-08, 0.7268128445463525, 0.002343925055838847], "function": "lambda x, A, B, C, D: (D + ((C - D) / (1 + numpy.exp((B - x) / A))))", "log_ftol": 1e-08, "errors": [3.692903446128507e-06, 4.045366231387058e-06, NaN, NaN], "covariance": [[1.3637535862427804e-11, -1.703329469307896e-27, -2.4240544021952965e-08, 3.1420882793530266e-08], [-1.703329469307896e-27, 1.6364987946046727e-11, -6.055822023776177e-08, 8.378902078274737e-08], [-2.6184068994608553e-08, -6.284176558706053e-08, -1531471527272.0977, 1538536777599.3833], [3.1420882793530266e-08, 8.378902078274737e-08, 1538536777599.3833, -1545634622566.0715]]}