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As an example the following are some important burst-data fields:  \begin{itemize}  \item \verb|nd|: number of photons detected through the donor channel (during during  donor excitation), excitation,  after correction \item \verb|na|: number of photons detected through the acceptor channel (during during  donor excitation), excitation,  after correction \item \verb|naa|: number of photons detected through the acceptor channel during  acceptor excitation, after correction  \end{itemize}