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Acquisition scheme for the dissolved and gas-phase 129Xe spectra. First, 200 (N) dissolved-phase 129Xe spectra were acquired by pulsing and acquiring on the red blood cell (RBC) resonance, +3,832 Hz above the gas-phase resonance. Then, with identical acquisition parameters, transmit and receive frequencies were lowered to match the gas-phase 129Xe resonance, and a single reference spectrum was acquired. TR, repetition time; TE, echo time.
