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Mz after a 6 ms composite MT pulse, as function of T2 and frequency offset (B0), based on simulation of the Bloch equations. The MT pulse effectively saturates spins with a T2 in the range from 20 to 400 μs at all offset frequencies (for a Lorentzian lineshape). Long T2 spins suffer only a small perturbation on resonance (< 5% for T2 > 36 ms), with a larger effect for frequencies > 500 Hz.
