dihedral_quadratic.html
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	<CENTER><A HREF = "http://lammps.sandia.gov">LAMMPS WWW Site</A> - <A HREF = "Manual.html">LAMMPS Documentation</A> - <A HREF = "Section_commands.html#comm">LAMMPS Commands</A>
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	<H3>dihedral_style quadratic command
	</H3>
	<P><B>Syntax:</B>
	</P>
	<PRE>dihedral_style quadratic
	</PRE>
	<P><B>Examples:</B>
	</P>
	<PRE>dihedral_style quadratic
	dihedral_coeff 100.0 80.0
	</PRE>
	<P><B>Description:</B>
	</P>
	<P>The <I>quadratic</I> dihedral style uses the potential:
	</P>
	<CENTER><IMG SRC = "Eqs/dihedral_quadratic.jpg">
	</CENTER>
	<P>This dihedral potential can be used to keep a dihedral in a predefined value.
	</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>K (energy)
	<LI>phi0 (degrees)
	</UL>
	<HR>

	<P><B>Restrictions:</B>
	</P>
	<P>This angle style can only be used if LAMMPS was built with the
	USER_MISC package. See the <A HREF = "Section_start.html#start_3">Making LAMMPS</A>
	section for more info on packages.
	</P>
	<P><B>Related commands:</B>
	</P>
	<P><A HREF = "dihedral_coeff.html">dihedral_coeff</A>
	</P>
	<P><B>Default:</B> none
	</P>
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