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exponential decay fit
from scipy.optimize import curve_fit
def exponential(t, A, tau, C):
return A * np.exp(-tau * t) + C
start = None # redefine
ydata = data[start:]
xdata = np.arange(ydata.shape[0])
popt, pcov = curve_fit(exponential, xdata, ydata, p0=(1.0, 1, 0]))
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