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Magnetic dipole-dipole coupling, illustrated for a 15N-1H spin pair. 15N and 1H magnetic moments are aligned parallel (or antiparallel) to the static magnetic field, Bo. The total magnetic field in the Bo direction at the 15N position can increase or decrease relative to Bo, depending on the orientation of the 15N-1H vector and the spin state of the proton (parallel or antiparallel to Bo).
