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CEST Z-spectra (A), AREXasym spectra (B), and the mean values of AREXasym signals (C) measured from the ghost membrane phantoms with pH of 6.6, 6.8, 7.0, and 7.2. Note that the mean values of AREXasym signals are derived by averaging the AREXasym signals from −5 ppm to −2 ppm in B.
