{"coeffs": [-2.460483301506638e-07, -4.791303867486338e-09, -0.25311912124726155, 0.0012724734419172889], "function": "lambda x, A, B, C, D: (D + ((C - D) / (1 + numpy.exp((B - x) / A))))", "log_ftol": 1e-08, "errors": [4.5877673606002185e-08, 3.134042087200589e-08, NaN, NaN], "covariance": [[2.10476093549887e-15, -1.02232989774544e-31, -9.763980132901511e-11, 7.241724665322926e-10], [-1.02232989774544e-31, 9.822219804344624e-16, -6.750115516945273e-11, 4.827816443548617e-10], [-6.034770554435772e-11, -4.526077915826829e-11, -60708173124.77337, 372030718257.24677], [7.241724665322926e-10, 3.620862332661463e-10, 372030718257.24677, -2279871855846.0923]]}