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The nested spectra for 1 ng/mL (fibrinopeptide A)2+ acquired with the 15.5 minute LC gradient in mobile phase A for a) and mouse plasma for b) and c). The mass spectrum in b) sums all drift times, while the mass spectrum in c) only sums a 1 ms drift time window (shown in red). Detection and deisotoping of the (fibrinopeptide A)2+ is only possible with the drift time window selection.
