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    * 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.

    * For relaxations in metals always use ISMEAR=1 or ISMEAR=2 and an appropriated SIGMA value (the entropy term should be less than 1 meV per atom). Mind: Avoid to use ISMEAR$>$0 for semiconductors and insulators, since it might cause problems.

      For metals a sensible value is usually SIGMA= 0.2 (which is the default).

    * 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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