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The fundamental data at the core of smFRET experiments is the array of photon  arrival timestamps, with a temporal resolution of the order of 10~ns. In single-spot  measurements, all the timestamps are stored in a single array. In multi-spot  measurements measurements~\cite{Ingargiola_2013}  we have as many timestamps arrays as the number of excitation spots.  Each array contains timestamps from both the donor (D) and the