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The diamagnetic correction for the effective magnetic moment (μeff) of [Co(ox)3]4- is 28. This correction is applied to account for the diamagnetic contribution of the ligands and the metal ion. The diamagnetic correction is typically subtracted from the experimentally determined μeff value to obtain the spin-only magnetic moment. This value can then be used to determine the number of unpaired electrons in the complex. The calculation of the diamagnetic correction is based on Pascal's constants, which are empirical values that reflect the diamagnetic susceptibility of different atoms and groups.