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Changes
In the literature, the values are often stated as "offset", "carrier offset", "offset of the spin-lock pulse" with values given in Hz, and can have values from 0-500 to 10-20.000 Hz.
These values reflects offset frequencies to the carrier frequency, and should be in relax is noted as: <br>$\omega_{rf}$, "Spin-lock offset, the frequency of of the rf field".$$\omega_{rf}$$
Relax needs input in ppm, and converts to the rad/s, with the following function calls.