deletions | additions       diff --git a/Concepts.tex b/Concepts.tex  index 0dfc75f..539f2f2 100644  --- a/Concepts.tex  +++ b/Concepts.tex 
...
burst search and to correct the raw burst counts by subtracting the background counts.  Furthermore, it is advisable to periodially estimate the background  in order to track occasional variations during the measurement. Experimentally  we found that when the background is not constant constant,  it varies on time scales of tens of seconds (see figure~\ref{fig:bg_timetrace}). FRETBursts splits the data in uniform time  slices called \textit{background periods} and computes the background rates for  each of these slices (see section~\ref{sec:bg_calc}). Note that the slicing