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\subsection{smFRET and burst analysis}  FRETBursts is a an  python package software  for burst analysis of confocal single-molecule FRET (smFRET) data. It is hosted and and openly developend on GitHub, where  issues and feature requests can be reported.  In this paper we provide an broad overview of the FRETBursts software. FRETBursts.  The paper is structured as follows. In section~\ref{sec:concepts} we  introduce some basic concepts and specific terminology.  In section~\ref{sec:analysis} we illustrate how to execute the several steps involved