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Z spectra and their respective asymmetry curves of water protons in gelatin. (a) Z spectra measured with the single-frequency rf irradiation and cosine pulses with the modulation frequencies 1 kHz, 2 kHz, 3 kHz, 4 kHz, 5 kHz, and 6 kHz. (b) The corresponding asymmetry curves calculated from the Z spectra shown in (a). The modulation frequencies of cosine pulses are indicated. The dashed line represents the zero asymmetry baseline.
