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If RPACOR is supplied and non zero, partial core corrections are
calculated. The partial core correction can improve the
transferability of pseudopotentials significantly,
if core and valence electrons overlap.
If RPACOR is a positive non zero value the core charge density
is truncated at RPARCOR and the corresponding truncated
charge density is used for the unscreening procedure.
If RPACOR is negative rhfsps searches for the point where
the core charge density is -RPACOR times larger as the valence charge density.
At this radius the core charge density is truncated.
MASTER USER VASP
Mon Mar 29 10:38:29 MEST 1999