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(a) The EXPORT pulse sequence for heteronuclear dipolar recoupling without decoupling embedded in a typical 2D NCO/NCA chemical shift correlation experiment. (b) The amplitude (red) and phase (blue) modulation schemes of the basic elements with the 13C and 15N fields represented by solid and broken lines, respectively, for EXPORT with C=6ωr, BI=3ωr/8, BS=5ωr/8, and ωr/2π=12 kHz.
