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Mass spectra of lysozyme (pI = 11.3) under (a,c) electrothermal supercharging (1050 V spray potential) and (b) native MS (700 V spray potential) conditions in 100 mM aqueous ammonium acetate (pH = 6.7) acquired with (a,b) ~1465 and (c) ~305 nm o.d. tips.
