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. Author manuscript; available in PMC: 2011 Sep 1.
Published in final edited form as: Anal Chem. 2010 Sep 1;82(17):7422–7429. doi: 10.1021/ac101578q

Figure 2.

Figure 2

Positive nESI spectrum of ubiquitin in 100% H2O with a) no acid vapor, b) acetic acid vapor, c) formic acid vapor, d) hydrochloric acid vapor leak-in. The strength of the acids used increases b–d.