{"coeffs": [-6.73749176089863e-08, -1.5144070953476227e-10, -0.3392153530911831, 0.001321003140137852], "function": "lambda x, A, B, C, D: (D + ((C - D) / (1 + numpy.exp((B - x) / A))))", "log_ftol": 1e-08, "errors": [1.17031283017247e-08, 6.3469154186575195e-09, NaN, NaN], "covariance": [[1.3696321204662966e-16, -8.909748615116945e-34, -1.1979512026009055e-12, -1.1220026194886001e-11], [-5.939832410077964e-34, 4.0283335331592556e-17, -1.7107197851063191e-12, -2.8050065487215003e-12], [-1.1220026194886001e-11, -1.4025032743607501e-12, -52593792631.107285, -52789071603.27068], [-1.1220026194886001e-11, -2.8050065487215003e-12, -52789071603.27068, -52985075639.64909]]}