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# KSPACING

**KSPACING** = [real]

Default: **KSPACING** = 0.5

Description: The tag **KSPACING** determines the number of k-points if the KPOINTS file
is not present.

**KSPACING** is the smallest allowed spacing between k points in units of
. The number of k-points increases when the spacing is decreased.
The number of k-points in the direction of the first, second and third
reciprocal lattice vector is determined by
These values are rounded to the next integer greater than or equal to
. In this equation
are the reciprocal lattice vectors
.
The generated grid is either centred at the
point (e.g. includes the
point) (
KGAMMA=*.TRUE.*) or is shifted away
from the point, as usually done for Monkhorst Pack grids (
KGAMMA=*.FALSE.*).
The default is to include the point.

Note: This implementation is not entirely consistent with the automatic k-point generation (Mode=A) used in the KPOINTS file. If the k-points are generated using the automatic mode in the KPOINTS file, is calculated as and rounding is to the nearest integer. We recommend to use the KSPACING tag in the INCAR file and to avoid using the automatic mode via the KPOINTS file.