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The direction of the main magnetic field B0, is commonly placed along the z-axis and the magnetization along this axis is Mz, which at equilibrium, equals M0. Left: Multiple individual spins precessing with the Larmor frequency around the axis of B0. The spin vectors have a random, incoherent phase with respect to each other. Right: Magnetization vector Mz, which at equilibrium, equals M0 (right).
