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. 2020 Dec 9;10:21586. doi: 10.1038/s41598-020-78684-6

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© The Author(s) 2020

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Number N_b of bridging ions between two PEs for different salt conditions: c_3:3 = 0.5 mM (a), c_3:3 = 5 mM (b). Errorbars represent the corresponding standard deviation ΔN_b. Please note that the systems were always in the presence of 20 mM 1:1 salt buffer.