MM2015 that were replaced by WMM2015v2.</p>
<p><strong>Note: The WMM is intended to be predictive. By using an older
set of coefficients, the returned values will reflect the older
predictions. If users need a good model of the Earth’s magnetic field
prior to the current WMM, please see the latest <a href="https://www.ngdc.noaa.gov/IAGA/vmod/igrf.html">IGRF</a> model,
which is retroactively updated. The <code>wmmVersion</code> feature is
intended for reproducibility purposes only.</strong></p>
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