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	<H3>improper_style cvff command
	</H3>
	<P><B>Syntax:</B>
	</P>
	<PRE>improper_style cvff
	</PRE>
	<P><B>Examples:</B>
	</P>
	<PRE>improper_style cvff
	improper_coeff 1 80.0 -1 4
	</PRE>
	<P><B>Description:</B>
	</P>
	<P>The <I>cvff</I> improper style uses the potential
	</P>
	<CENTER><IMG SRC = "Eqs/improper_cvff.jpg">
	</CENTER>
	<P>where phi is the Wilson out-of-plane angle.
	</P>
	<P>The following coefficients must be defined for each improper type via the
	<A HREF = "improper_coeff.html">improper_coeff</A> command as in the example above, or in
	the data file or restart files read by the <A HREF = "read_data.html">read_data</A>
	or <A HREF = "read_restart.html">read_restart</A> commands:
	</P>
	<UL><LI>K (energy)
	<LI>d (+1 or -1)
	<LI>n (0,1,2,3,4,6)
	</UL>
	<P><B>Restrictions:</B> none
	</P>
	<P><B>Related commands:</B>
	</P>
	<P><A HREF = "improper_coeff.html">improper_coeff</A>
	</P>
	<P><B>Default:</B> none
	</P>
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