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Frequency-dependence of editing in a 10mM GABA phantom: a) 14 ms editing pulses; and b) 20 ms editing pulses. Editing pulse frequency during ‘ON’ scans is expressed as an offset in ppm from 1.9 ppm. Editing pulses are maintained at 7.5 ppm during all ‘OFF’ scans. The integrals of these scans are plotted in c) against offset (left) and against offset normalized to pulse length (right).
