F="node13.html#sec:DFTsample">11.5</A>.

<P>
Many alternative exchange and correlation functionals are available to
the user as listed in table <A HREF="node13.html#tablexc">11.1</A>.  The following sections describe 
how to use these options.

<P>

<H2><A NAME="SECTION001331000000000000000">
11.3.1 Exchange-Correlation Functionals</A>
</H2>

<P>
There are several Exchange and Correlation functionals in addition to the 
default <TT>slater</TT> and <TT>vwn_5</TT>
functionals.  These are either local or gradi