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Experimental Z-spectra and MTRdouble on (a,b) agar and (c,d) boiled egg white phantoms. Note and Z-spectra for irradiation flip angle of π and 2π in (a) match especially at relatively lower power and far from water line. Also note the APT (3.5 ppm) and NOE (−3.5 ppm) peaks in (c) and (d).
