Hi,


I have a STIDF object that I have plotted using stplot.
stplot(ciotat.t, xlab = "Evolution du bāti au cours du temps depuis 1960",
number=12, pch=4)

Here is the result:
http://www.imagup.com/data/1128781498.html

I'd like to know how to superimpose a SpatialPolygons object above the plot,
for example, to integrate a city contour, and how to indicate at the top of
each map the time period considered instead of the generic "time"


Any help would be greatly appreciated

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