0
</PRE>
would mix 30% of the current iteration density with 70% of the
previous iteration density.

<P>
Level-Shifting<A NAME="tex2html32"
  HREF="footnode.html#foot3431"><SUP>11.4</SUP></A> is defined as the
amount of shift applied to the diagonal elements of the unoccupied
block of the Fock matrix.  The shift is specified by the
keyword <code>lshift</code>.  For example the directive,
<PRE>
  CONVERGENCE lshift 0.5
</PRE>
causes the diagonal elements of the Fock matrix
corresponding to the virtual orbita