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	<H3>fix gran/diag command
	</H3>
	<P><B>Syntax:</B>
	</P>
	<PRE>fix ID group-ID gran/diag nevery file zlayer
	</PRE>
	<UL><LI>ID, group-ID are documented in <A HREF = "fix.html">fix</A> command
	<LI>gran/diag = style name of this fix command
	<LI>nevery = compute diagnostics every this many timesteps
	<LI>file = filename to store diagnostic info in
	<LI>zlayer = bin size in z dimension
	</UL>
	<P><B>Examples:</B>
	</P>
	<PRE>fix 1 all gran/diag 1000 tmp 0.9
	</PRE>
	<P><B>Description:</B>
	</P>
	<P>Compute aggregate density, velocity, and stress diagnostics for a
	group of granular atoms as a function of z depth in the granular
	system. The results are written to 3 files named file.den, file.vel,
	and file.str. The z bins begin at the bottom of the system and extend
	upward with a thickness of zlayer for each bin. The quantities
	written to the file are averaged over all atoms in the bin.
	</P>
	<P><B>Restrictions:</B>
	</P>
	<P>Can only be used if LAMMPS was built with the "granular" package. Can
	only be used with atom_style granular.
	</P>
	<P><B>Related commands:</B>
	</P>
	<P><A HREF = "atom_style.html">atom_style granular</A>
	</P>
	<P><B>Default:</B> none
	</P>
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