{"coeffs": [-2.6404490682807734e-07, 6.727861290816652e-09, -0.3170929360953931, 0.000616421171210433], "function": "lambda x, A, B, C, D: (D + ((C - D) / (1 + numpy.exp((B - x) / A))))", "log_ftol": 1e-08, "errors": [4.2314328163051556e-08, 2.5912123551223115e-08, NaN, NaN], "covariance": [[1.790502367890418e-15, 0.0, -0.0, 0.0], [0.0, 6.714381469338516e-16, -0.01771810368356142, 0.0006501521139102044], [0.0, -0.01181206912237428, -4.086554912418911e+27, 1.1698106650714919e+26], [0.0, 0.0005536907401112944, 1.1698106650714915e+26, -3.348681276633058e+24]]}