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¡°Derived grid: Specify the quality of the FFT grid. Three options are available:
Standard
Fine
Precise
The FFT grid parameters are chosen such that they provide a good representation of the electron density. At the Precise level, an exact representation of the density is provided for the given energy-cutoff. At the Standard and Fine levels, a reduced FFT grid is used to speed up the calculation. Some aliasing will occur as a result but the effect on the SCF solution is usually small.
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