{"coeffs": [-1.4369220556544372e-07, -1.4938874858296853e-08, -0.17386597956521302, 0.002010700361156563], "function": "lambda x, A, B, C, D: (D + ((C - D) / (1 + numpy.exp((B - x) / A))))", "log_ftol": 1e-08, "errors": [6.366486229185589e-08, 5.2972367452033314e-08, NaN, NaN], "covariance": [[4.053214690640975e-15, -3.1640430817516574e-32, 1.1258577698805615e-10, -7.470885499809804e-11], [-4.746064622627486e-32, 2.806071713473238e-15, 1.654607683026077e-10, -1.4941770999619608e-10], [1.1206328249714706e-10, 1.8677213749524508e-10, -200341339844.07773, 375981233960.79114], [-7.470885499809804e-11, -1.4941770999619608e-10, 375981233960.79114, -705605185633.1731]]}