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adding a bravais pearson test to spplot

I also suggest you take this question to R-Sig-geo.

Since spplot() is built on the lattice package, adding new elements to an
existing plot is, in my experience, difficult to learn how to do. If you
can possibly start with plot() instead of spplot() you will, I think, find
it much easier to add contour lines.

It will all depend on what kind of objects your data are.

Here is an example that might help, or at least give you a few more things
to look at.
Checking rgeos availability: TRUE