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(a) The auto-correlation functions of the donor (Cxx) and the acceptor (Cyy) traces for the traces shown in Fig. 1b, showing that {xi} and {yi} are not mutually independent within their respective set. (b) The cross-correlation, Cxy. It is clear that the unscaled confidence region, c1-α at α = 0.05, does not encompass the cross-correlation function because the different time lags (m) in Cxy(m) are no longer independent.
