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1.For semiconductors or insulators use the tetrahedron method (ISMEAR=-5), if the cell is too large (or if you use only a single or two k-points) use ISMEAR=0 in combination with a small SIGMA=0.05.
2.For the calculations of the DOS and very accurate total energy calculations (no relaxation in metals) use the tetrahedron method (ISMEAR=-5)

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