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The offset is in the literature noted as $\Omega_S$, where $\Omega_S$ is the (Ex. $^{15}$N) resonance offset from the spin-lock carrier.
Note that $\Omega_S$ is dependent of the [[wikipedia:Chemical_shift | chemical shifts]] $\delta$ in ppm for the nuclei of interest, and is first calculated later.
The [[wikipedia:Chemical_shift | Chemical Shifts]] $\delta$ in ppm for nuclei of interest (ex. $^{15}$N and which have been loaded in with relax function [http://www.nmr-relax.com/manual/chemical_shift_read.html chemical_shift_read] from a [http://www.nmr-relax.com/manual/spectrum_read_intensities.html peak list formatted file]) is first converted to to the rad/s with the following function calls.<br>