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An additional option to control the number of included conduction
and valence band pairs is OMEGAMAX. All
conduction-band () and valence-band () pairs with an
energy difference smaller than OMEGAMAX
are included in the BSE matrix. Note that pairs must satisfy
both criteria, the band "window" specified by NBANDSO and NBANDSV,
as well as the OMEGAMAX criteria.
If OMEGAMAX is not specified in the INCAR file, it defaults
to the largest transition energy
of the bands included in the BSE calculation
(as specified by NBANDSO and NBANDSV).
Furthermore, OMEGAMAX controls the energy window for the
dielectric function written to vasprun.xml. The number
of grid points is determined by the NEDOS parameter.
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