{"coeffs": [-1.330089801836517e-07, 9.69852711441078e-09, -0.26016971536339756, 0.0013640119161574143], "function": "lambda x, A, B, C, D: (D + ((C - D) / (1 + numpy.exp((B - x) / A))))", "log_ftol": 1e-08, "errors": [3.1165223574033166e-08, 2.1289898285234892e-08, NaN, NaN], "covariance": [[9.712711604194727e-16, -8.845656057664197e-33, 4.217091779431924e-11, 5.569657291427499e-11], [-8.845656057664197e-33, 4.532597689956476e-16, 7.375503917422192e-12, 0.0], [2.7848286457137497e-11, 6.962071614284374e-12, -65619431185.93843, -185791272426.7423], [-5.569657291427499e-11, -1.3924143228568748e-11, -185791272426.7423, -526039258282.1551]]}