deletions | additions       diff --git a/Concepts.tex b/Concepts.tex  index a68748a..c3d7310 100644  --- a/Concepts.tex  +++ b/Concepts.tex 
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single-spot measurements, to access the array for some burst-data  we have to specify the 0 index, for example \verb|Data.nd[0]|.  \verb|Data| implements a shortcut syntax to access the first element of a list  with an undescore, underscore,  so we can type \verb|Data.nd_| instead of accessing \verb|Data.nd|.  \subsection{Introduction to burst search} 
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By default, in order to speed-up batch processing, FRETBursts notebooks display plots   as static images using the \textit{inline} matplotlib backend.   User can choose switch to interactive figures by using an interactive backend.   For example \verb|\%matplotlib \verb|%matplotlib  notebook| provides interactive figures inside the browser, and \verb|\%matplotlib qt| for interactive figures in a new window (using the QT4 graphical library).  A few plot functions such as \verb|timetrace| and \verb|hist2d_alex| have interactive features