{"coeffs": [-2.5106626212929453e-07, -5.2214370708300535e-09, -0.2535390918375403, 0.0012211517221288374], "function": "lambda x, A, B, C, D: (D + ((C - D) / (1 + numpy.exp((B - x) / A))))", "log_ftol": 1e-08, "errors": [2.4186273161571157e-08, 1.6523638950112824e-08, NaN, NaN], "covariance": [[5.849758094461373e-16, 1.4899197917230408e-26, -4.498272297676907e-05, 8.441721268948353e-05], [1.9062541652860546e-26, 2.730306441536856e-16, 9.532062335206962e-12, -8.387502773519767e-12], [-4.498273094956956e-05, 8.387502773519767e-12, -22493236481.877716, 42212119092.24124], [8.441722107698631e-05, 0.0, 42212119092.24124, -79217723945.29187]]}