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\label{fig:altern_hist_double} \textbf{Alternation histograms for \usalex and ns-ALEX measurements.}  Histograms used for the selection/determination of the alternation periods for two typical smFRET-ALEX experiments.  Distributions of photons detected by donor channel are in \textit{green}, and by acceptor channel in \textit{red}.  The light \textit{green} and \textit{red} shaded areas indicate the donor and acceptor period definitions.