The medium is piecewise constant with a single interface at z=0.
Initial data is zero.
Boundary data is a velocity impulse at the top (z=1) boundary near
x=y=t=0.
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Pressure computed on a 60 x 60 x 60 grid
The interface is indicated by the dashed line.
The sound speed and impedance are
c = Z = 1 for z>0,
c = Z = 2 for Z<0.
The 3d plots on the left were obtained with
xSliceCoords = 0;
ySliceCoords = 0;
zSliceCoords = [ ];
The 2d plots on the right were obtained with view(ySlice)
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