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(a) Mass shifts for the primary isotopic peaks obtained from isolation windows of 18C6 adducts with Ac-RGx, Ac-KGx, and Gx peptides. Reduced intramolecular charge solvation in polyglycine leads to greater 18C6 adduct stability and smaller mass shifts. (b) The magnitude of the mass shifting is reduced if the scan speed of the instrument is decreased
