deletions | additions       diff --git a/background-estimation.tex b/background-estimation.tex  index 99a99cf..24d06bf 100644  --- a/background-estimation.tex  +++ b/background-estimation.tex 
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\verb|bg| namespace (see the   \href{http://fretbursts.readthedocs.org/en/latest/background.html}  {\texttt{background} module}). The second argument, \verb|time_s|, is the   duration of the  \textit{background period} (section~\ref{sec:bg_intro}) and the third argument is the threshold above which the distribution is exponential. It is possible to use different thresholds for each photon stream passing a   \href{https://docs.python.org/2/tutorial/datastructures.html#tuples-and-sequences}{tuple}   as \verb|tail_min_us| (instead of a scalar).