{"coeffs": [-1.853494438969196e-07, 2.537944494065627e-10, -0.3417634815670125, 0.001169188430711192], "function": "lambda x, A, B, C, D: (D + ((C - D) / (1 + numpy.exp((B - x) / A))))", "log_ftol": 1e-08, "errors": [4.190816507846607e-08, 2.2727984947427248e-08, NaN, NaN], "covariance": [[1.7562943002439633e-15, -1.1425068704588333e-32, -9.52098129666903e-12, 2.697668075751543e-11], [-5.712534352294166e-33, 5.165612997704796e-16, 4.163856958598247e-12, 8.99222691917181e-12], [-8.99222691917181e-12, 0.0, -39858628026.3592, 41140981239.35973], [3.596890767668724e-11, 8.99222691917181e-12, 41140981239.35973, -42464591009.455124]]}