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Three-pulse ESEEM waveforms of (A) Fibrillar Cu2+-Aβ(1-40), (B) 13C,15N-His13-Cu2+-Aβ(1-40), (C) 13C,15N-His14-Cu2+-Aβ(1-40), (D) envelope division; B divided by A, (E) envelope division; C divided by A. The vertical scale bar corresponds to 25% of the echo amplitude at τ + T = 8 μs. Aquisition Parameters: microwave frequency, 8.750 GHz, B0 = 303 mT, T = 6 K, τ = 310 ns.
