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Ion mobility-mass spectrometry (ESI-IM-MS) experiments. A) Distributions of the collision cross sections (CCS) of the syndecan ectodomains as a function of charge state. The dashed lines indicate the limits of the CCS space as estimated in each case from the model of Beveridge et al. [44]. B) Global distribution of ED-4, containing both the monomeric (orange) and dimeric (blue) forms. Their extracted charge state distributions are displayed in (C).
