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Figure 1 The atomic arrangement around Ba and Ga atoms in the structure of Ba4GaN3O. Displacement ellipsoids are drawn at 70% probability. Symmetry codes: (i) x, −y + , z + ; (ii) −x + , y + , z; (iii) x + , y, −z + ; (iv) x + , −y + , −z; (v) −x, y + , −z + . |