{"coeffs": [-4.461362520049233e-07, 1.908900269335505e-09, -0.2573454849476478, 0.0007191504899601074], "function": "lambda x, A, B, C, D: (D + ((C - D) / (1 + numpy.exp((B - x) / A))))", "log_ftol": 1e-08, "errors": [7.100894855198986e-08, 4.8508316421307585e-08, NaN, NaN], "covariance": [[5.042270774459143e-15, 1.224572365064337e-31, 3.0902262288732137e-09, -4.951446346362064e-10], [1.1384696206457508e-31, 2.353056762029699e-15, -1.3878910782307767e-08, 2.7208582877705072e-09], [3.0902262288732137e-09, -1.3878910782307767e-08, -543104168205270.2, 87388404129477.77], [-4.947072690959312e-10, 2.891439746314118e-09, 87388404129477.77, -14061267843944.379]]}