The following plot was made using meshc.  It allows a curtain countour to be seen below the 3-D image.
The following plot was made using surfl.  It is a top view of the particle displacement.  You can see the path of travel of the piston projected in a specific direction.  This path is more directed that the previous one because it is a tappered piston.
The following plot was made using surfl.  It is a side view of the particle displacement.  You can see the pulse in a 3-D projection:
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