{"coeffs": [-2.141343138302862e-07, -9.880076205147374e-09, -0.3740664309441117, 0.0010587083766281087], "function": "lambda x, A, B, C, D: (D + ((C - D) / (1 + numpy.exp((B - x) / A))))", "log_ftol": 1e-08, "errors": [5.000105207238154e-08, 2.357072395211353e-08, NaN, NaN], "covariance": [[2.5001052083450104e-15, -6.505486850290063e-33, -6.8269540125686685e-12, 2.0688908184898178e-11], [5.4212390419083856e-33, 5.555790276267384e-16, 3.4134770062843343e-12, 7.449965368174657e-12], [-5.120215509426502e-12, 5.120215509426502e-12, -18600513652.776073, 16119689404.523357], [2.0480862037706007e-11, 7.680323264139753e-12, 16119689404.523357, -13969742521.573936]]}