Revision of the Mg(ClO₄)₂·4H₂O crystal structure

The restrained Rietveld analysis of the crystal structure of magnesium perchlorate tetrahydrate, Mg(ClO₄)₂(H₂O)₄ [Robertson & Bish (2010). Acta Cryst. B66, 579-584], is revised. The structure is re-refined in the C2/m space group by the derivative difference method, anisotropically for all non-H atoms and isotropically for H atoms without restraints.