licitly for each field value. This is the accurate method. In many cases, using <code>'approxlin'</code> or <code>'approxinv'</code> results in much faster simulations. For these settings, a frequency-swept spectrum is calculated first and then converted to the field domain. This procedure is only approximate. <code>'approxinv'</code> works best if the g anisotropy dominates the spectrum, in all other cases (e.g. dominant hyperfine or zero-field splittings), <code>'approxlin'</code> is preferable.
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