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Contour plots of four two-dimensional matrices

What is it that you want to do with these 4 plots? Overlay them with  
different color contours or plot them side-by-side on the same page?

?par  # for filled.contour but the implementation will be different  
for those two options.

  contourplot is is a lattice plotting function. See Figure 6.10 on  
Sarkar's Lattice book pages. levelplot is the closest analog to filled  
contour in lattice.