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Usually VASP uses the standard interpolation for the
correlation part of the exchange correlation functional.
If VOSKOWN is set to 1 the interpolation formula
according to Vosko Wilk and Nusair[46] is used.
This usually enhances the magnetic moments and
the magnetic energies. Because the Vosko-Wilk-Nusair interpolation
is the interpolation usually applied in the context
of gradient corrected functional, it
might be desirable to use this interpolation whenever the
PW91 functional is used.
MASTER USER VASP
Mon Mar 29 10:38:29 MEST 1999