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Diamagnetic correction is used in magnetic susceptibility measurements to account for the small, negative contribution of electron pairs in closed shells. The calculation involves adding a constant value to the measured magnetic susceptibility, which depends on the specific element and its oxidation state. The diamagnetic correction is usually a small value compared to the paramagnetic contribution and is often neglected. To get a more accurate measurement, a diamagnetic correction should be applied, but it is beyond the scope of this response. For more detail, consult a textbook on magnetism or magnetic susceptibility.