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    Vince Hendriks

    For the FeI atoms we have 3 4fold rotation axis due to the cubic symmetry: we can define 3 axis such that a rotation of 90 degrees over any of these axis results in an identical system. This means the EFG tensor is zero according to theorem 2. For the FeII atoms we have the vertical axis through N and the the FeII atom in the top and bottom face as a 4-fold rotation axis and the two perpendicular axis going through the iron atoms on the side faces being 2-fold rotation axis, thus we see in the PAS there is axial symmetry around the vertical axis.

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