improper_zero.html
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			<H3>improper_style zero command
			</H3>
			<P><B>Syntax:</B>
			</P>
			<PRE>improper_style zero
			</PRE>
			<P><B>Examples:</B>
			</P>
			<PRE>improper_style zero
			improper_coeff *
			</PRE>
			<P><B>Description:</B>
			</P>
			<P>Using an improper style of zero means improper forces and energies are
			not computed, but the geometry of improper quadruplets is still
			accessible to other commands.
			</P>
			<P>As an example, the <A HREF = "compute_improper_local.html">compute
			improper/local</A> command can be used to
			compute the chi values for the list of quadruplets of improper atoms
			listed in the data file read by the <A HREF = "read_data.html">read_data</A>
			command. If no improper style is defined, this command cannot be
			used.
			</P>
			<P>Note that the <A HREF = "improper_coeff.html">improper_coeff</A> command must be
			used for all improper types, though no additional values are
			specified.
			</P>
			<P><B>Restrictions:</B> none
			</P>
			<P><B>Related commands:</B> none
			</P>
			<P><A HREF = "improper_none.html">improper_style none</A>
			</P>
			<P><B>Default:</B> none
			</P>
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