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(A) UVPD (one 2.5 mJ laser pulse) of ubiquitin 12+, (B) ETUVPD (8 ms ETD in LIT of ubiquitin 13+ followed by one 1.8 mJ laser pulse of ubiquitin 12+·) (MS3), (C) ETUVPD (15 ms ETD of 13+ ubiquitin in HCD cell followed by one 2.5 mJ laser pulse of all product ions). All spectra are shown on the same scale.
