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Collision cross section (ccs) distributions for Fe(II)/H2O2-treated ubiquitin of charge states +7 (a) and +8 (b) electrosprayed from different water:formic acid solutions. The solution pH is labeled for each of the distributions. Distributions for unmodified and oxidized ubiquitin are plotted as black dashed lines and red solid lines, respectively. The distributions are normalized by the integrated peak intensity.
