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The test results of the k-point for three iron oxides, the horizontal direction is the parameter of the same oxide ((a,b) for Fe2O3, (c,d) for Fe3O4, (e,f) for FeO, (g,h) for FeO*), and the vertical direction is the comparison of the same calculation result. The histogram is the calculation time, the orange dotted line is the position of the final value.
