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implementations of the same method or to compare the accuracy   of different methods.  In order contrast these issues issues,  we developed FRETBursts, an open source python software for burst analysis of freely-diffusing  single-molecule smFRET experiments.   With FRETRBursts weaim to  provide a tool that is available to any scientist to use, study and modify.   FRETBursts is hosted and openly developed~\cite{Prli__2012} on GitHub,   and we encourage users to send comments, report issues or contribute code