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\noindent where $n_d$, $n_a$ and $n_{aa}$ are, similarly to the attributes  in table~\ref{tab:data_n}, the background-corrected  burst counts in different channels and excitation periods.  $\gamma$, called the ``γ factor'', The factor γ  takes into account different quantum yields of donor and acceptor dyes and different  photon detection efficiencies between donor and acceptor detection  channels~\cite{Lee_2005}.