a E^{\rm Becke88}_{X} + E^{\rm VWN}_C + a_C \Delta E^{Perdew91}_C \\
& &{\rm where } \\
a_0 &=& 0.20, \ a_X = 0.72, \ a_C = 0.81
\end{eqnarray*}
 -->
<IMG
 WIDTH="552" HEIGHT="126" BORDER="0"
 SRC="img109.gif"
 ALT="\begin{eqnarray*}
E_{XC} \ &amp;=&amp; \ a_0 E^{\rm HF}_X + (1-a_0) E^{\rm Slater}_{X} +...
...\\
&amp; &amp;{\rm where } \\
a_0 &amp;=&amp; 0.20, \ a_X = 0.72, \ a_C = 0.81
\end{eqnarray*}">
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and <IMG
 WIDTH="17" HEIGH