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Modulation imposed by ion magnetron motion on (a) relative intensities of (M + 6H)5+• reduced ions produced by electron irradiation of ubiquitin (M + 6H)6+ ion, (b) depletion of the (M + 6H)6+ ion abundance by IRMPD, (c) post-ECD IR activation: depletion of (M + 6H)5+• reduced ions.
