			This is a simple example of showing the computation of virutal x-ray
			and electron diffraction patterns for Ni.

			In addition to the LAMMPS output, a simple visualizaiton of the electron
			diffraction data is included. The visualization was created using the VisIt
			Open Source visualiztion software develeoped at Larrence Livermore National
			Laboraatory (https://wci.llnl.gov/simulation/computer-codes/visit/).

			Below is a step by step guide to produce similar images:

			a) Open the diffraction .vtk files in VisIt

			b) Click add->pseudocolor->intensity;

			*Note, green name means its ready to be drawn

			c) Click Draw;

			*Note, you will see the full rectangular mesh grid which is what we
			are wanting.

			We need to remove ghost data (those values set to -1).

			d) Select intensity plot;

			Click Operators->Selection->Isovolume;
			Double click isovolume (under intensity plot);
			Change lower bound to 0;
			Click Apply;
			Click Dismiss;
			Click Draw;

			*Note, now you will see only where there was valid intensity data (if you
			don't use Zone it will be a sphere). But most intensity are low so color
			the intensity by log scale.

			e) Select intensity plot

			Double click Pseudocolor;
			Change Scale to Log;
			Check Mimimum Limit;
			Input non-zero minimum limit (i.e. 1);
			Click Apply;
			Click Dismiss;

			Note, clicking apply will change the scale automatically. But unless
			you have used Zone and a thin dR_Ewald you likely have lots of extra
			data visualized that does not intersect the Ewald sphere. Next, we
			want to take a spherical slice to mimic the intersection of Ewald's
			sphere with reciprocal space.

			f) Select intensity plot;
			Click Operators->Slicing>Spherical Slice;
			Double click Spherical Slice;
			Change the origin/radius to represent the center of your Ewald sphere;
			(i.e. 39.84063 0 0) and radius (i.e. 39.84063) for lambda = 0.251
			Click Apply;
			Click Dismiss;
			Click Draw;

			This is the saed pattern, but we are not guaranteed to be aligned correctly
			with the zone axis.

			g) On the menu bar... select Controls -> View;

			Change View Normal to the zone axis of choice (i.e. -1 0 0);
			Adjust Up Vector if desired (i.e. 0 1 0);
			Turn off Perspective view;
			Click Apply;
			Click Dismiss;

			*Note that for the primary x, y, and z zone axis you can use the drop
			own Align to axis. However, it is likely that there is a bunch of extra
			annotations on the image that don't look appealing.

			h) On the menu bar... select Control-> Annotation;

			*Here you can change what is visualized along side the data and how
			you display axis information. I typically turn most all the display
			information off.

			i) Save the image

			Click File-> Set save options
			Click Save

			** Note, further fine tuning can be achieved by adjusing the color table and
			max/min values **

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