{"coeffs": [-3.748810822853738e-06, -5.5753517508890174e-08, -0.4141376316017911, 0.0004164873038560985], "function": "lambda x, A, B, C, D: (D + ((C - D) / (1 + numpy.exp((B - x) / A))))", "log_ftol": 1e-08, "errors": [1.2632684802394122e-06, 5.019721240839227e-07, NaN, NaN], "covariance": [[1.5958472531663944e-12, -4.152530614649455e-30, 3.830033475334115e-09, -1.0699514672061242e-09], [1.0381326536623637e-30, 2.5197601335732507e-13, -0.0, 3.6847410148788987e-10], [3.98323481434748e-09, 1.225610712106917e-09, -600005439083.2172, 180868217121.86572], [-1.1490100426002347e-09, 0.0, 180868217121.86572, -54521692361.36744]]}