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a) Total mass spectrum of the Qβ phages on a NALDI™ plate. b) Coincidence mass spectrum of ions co-emitted with [Adenine-H]− from the phages. c) Coincidence/anticoincidence mass spectrum constituted by events containing [Adenine-H]− but without F−. Coincidence and coincidence/anticoincidence mass spectra are normalized to the corresponding numbers of events.
