2||ssf) default erf1]
</PRE>

<P>
<DL>
<DT><STRONG><TT>becke</TT></STRONG></DT>
<DD>A. D. Becke, J. Chem. Phys. <B>88</B>, 1053 (1988).
</DD>
<DT><STRONG><TT>ssf</TT></STRONG></DT>
<DD>R.E.Stratmann, G.Scuseria and  M.J.Frisch,
Chem. Phys. Lett. <B>257</B>, 213 (1996).
</DD>
<DT><STRONG><TT>erf1</TT></STRONG></DT>
<DD>modified ssf
</DD>
<DT><STRONG><TT>erf2</TT></STRONG></DT>
<DD>modified ssf
</DD>
</DL>

<P>
Erf<IMG
 WIDTH="14" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
 SRC="img120.gif"
 ALT="$n$"> partioning 