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	<H3>dihedral_style opls command
	</H3>
	<P><B>Syntax:</B>
	</P>
	<PRE>dihedral_style opls
	</PRE>
	<P><B>Examples:</B>
	</P>
	<PRE>dihedral_style opls
	dihedral_coeff 1 90.0 90.0 90.0 70.0
	</PRE>
	<P><B>Description:</B>
	</P>
	<P>The <I>opls</I> dihedral style uses the potential
	</P>
	<CENTER><IMG SRC = "Eqs/dihedral_opls.jpg">
	</CENTER>
	<P>Note that the usual 1/2 factor is not included in the K values.
	</P>
	<P>This dihedral potential is used in the OPLS force field and is
	described in <A HREF = "#Watkins">(Watkins)</A>.
	</P>
	<P>The following coefficients must be defined for each dihedral type via the
	<A HREF = "dihedral_coeff.html">dihedral_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>K1 (energy)
	<LI>K2 (energy)
	<LI>K3 (energy)
	<LI>K4 (energy)
	</UL>
	<P><B>Restrictions:</B> none
	</P>
	<P><B>Related commands:</B>
	</P>
	<P><A HREF = "dihedral_coeff.html">dihedral_coeff</A>
	</P>
	<P><B>Default:</B> none
	</P>
	<HR>

	<A NAME = "Watkins"></A>

	<P><B>(Watkins)</B> Watkins and Jorgensen, J Phys Chem A, 105, 4118-4125 (2001).
	</P>
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