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Ion/ion reaction data for ubiquitin [U + 7H]7+ ions and PDPA dianions (a) over the m/z range between 1200 and 2400 Th in positive mode, (b) over the m/z range between 2500 and 10000 in positive mode, and (c) over the m/z range between 2500 and 10000 in negative mode. X represents PDPA.
