deletions | additions       diff --git a/Introduction.tex b/Introduction.tex  index e4f1182..3416812 100644  --- a/Introduction.tex  +++ b/Introduction.tex 
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single-molecule FRET (smFRET) data. The software can analyze smFRET measurements  with one or several excitation spots~\cite{Ingargiola_2013}. The supported   excitation schemes include single lasers, two alternating CW lasers (µs-ALEX\cite{Kapanidis_2005})   and 2 two  interleaved pulsed lasers (ns-ALEX or PIE\cite{M_ller_2005}). FRETBursts is hosted and and openly developed~\cite{Prli__2012} on GitHub, where  issues, feature requests and contributions can be reported. 
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In section~\ref{sec:concepts} we  introduce a few preliminary concepts and some specific terminology.  In section~\ref{sec:analysis} we illustrate how to execute the several steps involved  in smFRET burst analysis: data loading (section~\ref{sec:dataload}), defining the excitation  alternation periods (section~\ref{sec:alternation}), background correction (section~\ref{sec:bg_calc}), burst search (section~\ref{sec:burstsearch}),   burst filtering (section~\ref{sec:burstsel}), (section~\ref{sec:burstsel}) and  FRET fitting (section~\ref{sec:fretfit}). For each step different approached approaches  and options are discussed. In section~\ref{sec:conclusions} we conclude by  stating what we believe to be are  the strengths of this software.  In addition to this paper, we refer the interested readers to the