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Comparison of spectra recorded at three different protein concentrations. Spectra of samples a 180 µM, top, b 410 µM, middle and c 600 µM, bottom recorded at 700 MHz, 950 MHz and 800 MHz respectively. Spectra of sample A and B were annotated with the assignment. Notice that, for clarity, the counter levels were chosen to exclude noise. Thus, not all of the duplicated peaks observed in the spectrum of sample B are visible
