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\section{smFRET data analysis}  \subsection{Introduction}  In the following we provide a high-level description of FRETbursts usage. In general, we suggest to import FRETbursts with the expression:  \begin{verbatim}  >>> import fretbursts as fb  \end{verbatim}  that will make available all the FRETBursts functions with a concise `fb.` prefix. In this article, however, we assume that FRETBursts is imported with the shortcut form:  \begin{verbatim}  >>> from fretbursts import *  \end{verbatim}  that allows to skip the \verb|fb.| prefix and also imports some common numeric libraries (numpy and matplotlib.pyplot imported as \verb|np| and \verb|plt| respectively).  \section{Architecture and concepts}  \subsection{Photon streams}  \label{sec:ph_streams}