Line width in sp maps

Hi,

I am trying to change the line width in (shape) maps
produced using sp package, but without success.
All my attempts with lwd parameter failed.
I found a brute force solution to save the map in
EPS and change the linewidth there - but I would
expect that there is a regular solution.

Please include at least an indication of which functions you are using. 
The following for SpatialLines objects does work:

library(sp)
SLDF <- contourLines2SLDF(contourLines(volcano))
length(slot(SLDF, "lines"))
plot(SLDF, lwd=1:10)

and this works for SpatialPolygons:

grd <- GridTopology(c(1,1), c(1,1), c(10,10))
polys <- as.SpatialPolygons.GridTopology(grd)
plot(polys, lwd=3)

both for base graphics. Are you using spplot()?

Roger

best regards,  Vladimir Batagelj

Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no