{"coeffs": [-6.205575718229428e-08, 2.740401069713038e-09, -0.36066227575629367, 0.0003888597361164124], "function": "lambda x, A, B, C, D: (D + ((C - D) / (1 + numpy.exp((B - x) / A))))", "log_ftol": 1e-08, "errors": [6.495738152983918e-08, 3.062120383965015e-08, NaN, NaN], "covariance": [[4.219461415213092e-15, 0.0, 0.0, -0.00013521976195132038], [0.0, 9.37658124589405e-16, 0.0, 0.0], [0.004639347029473969, 0.0, -5.075101300662199e+25, -2.871616721962759e+24], [0.0, 0.0, -2.8716167219627585e+24, -1.6248311332781035e+23]]}