Just found it!!!! Still not sure what the third entries are, but it's a start!
# create a vtk data file
sp = pyvtk.StructuredPoints ((nx, ny, 1), (xmin, ymin, 0), (dx,
dy, 1))
pd = pyvtk.PointData(pyvtk.Scalars(z, name='Scalars',
lookup_table="default"))
Tyler
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