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By plotting the histogram of the timestamps modulo the alternation period  is possible to identify the donor and acceptor periods (see figure~\ref{fig:altern_hist_double}a).  In ns-ALEX measurements, pulsed lasers are interleaved with typical separation of 10-100~ns.  In this case the histogram of the TCSP TCSPC  nanotimes will allow to define the definition of  the period starting with a donor (or acceptor) of fluorescence after  excitation pulse of either the donor or the acceptor  (see figure~\ref{fig:altern_hist_double}b). In both cases, the functions  \verb|plot_alternation_hist|