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(A–D) Site-specific chemical shift perturbations and (E) SNR comparisons between EM-ASR and PL-ASR. For N and CA shifts and for the relative SNR, EM/PL data is combined from NCA, CANCO, and NCACB experiments. The relative SNR EM/PL is calculated with consideration for the number of scans performed on each sample and the relative amounts of UCN ASR present in each sample.
