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\subsection{Photon Streams}  \label{sec:ph_streams}  The raw data collected during a smFRET experiment consists in one or more arrays of photon timestamps, whose temporal resolution is set by the acquisition hardware. This resolution hardware,  typically ranges from less than a nanosecond to a few tens of nanoseconds. between 10 and 50 ns.  In single-spot measurements, all timestamps are stored in a single array. In multispot  measurements~\cite{Ingargiola_2013}, there are as many timestamps arrays  as excitation spots.