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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">
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			<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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