deletions | additions       diff --git a/Concepts.tex b/Concepts.tex  index 622b9ed..6c19c68 100644  --- a/Concepts.tex  +++ b/Concepts.tex 
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The \verb|Data| class   (\href{http://fretbursts.readthedocs.org/en/latest/data_class.html}{link})  is the fundamental data container in FRETBursts. It contains the  measurement data and paramenters parameters  (attributes) as well as several methods for data analysis (background estimation, burst search, etc...).   All analysis results (bursts data, estimated parameters) are also stored  as \verb|Data| attributes. 
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$m$ consecutive photons detected during a period shorter than  $\Delta t$. In other words, bursts are regions of the photon stream where the  local rate (computed using $m$ photons) is above a minimum threshold rate.   Eggeling did not provide Since  a universal  criterionon how  to choose the rate threshold and the number of photons $m$ and, therefore, is, as of today, lacking,  it has become a common practice to manually adjust those parameters for each specific measurement.  A more general approach consists in taking into account the background rate of