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In DCBS a search is performed independently on two photon streams   and bursts are marked only when both photon streams exhibit a rate higher than   the threshold, implementing an AND-gate logic.  Usually, Conventionally,  the term DCBS refers to a burst search where the two photon streams are (1) all photons  during donor excitation (\verb|Ph_sel(Dex='DAem')|) and (2) acceptor channel photons  during acceptor