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plot filled.contour over continent map

Ray Brownrigg 
You just have to RTFM!

?filled.contour tells you you cannot add points (or lines) to a finished plot, and tells 
you how to do what you want.

So, based on your most recent offline message, try:

filled.contour(x, y, mslp, zlim = c(1000,1020),
  color.palette = colorRampPalette(c("blue", "lightblue", "yellow", "orange", "red")),
  xlab = "Longitude (?)", ylab = "Latitude (?)",
  xlim = c(-5, 40), ylim = c(35, 70), nlevels = 25,
  plot.axes = {axis(1); axis(2);			### this is the key part
    map('worldHires', xlim = c(-5, 40), ylim = c(35, 70), add = T, col = "darkgrey")}
)

Ray Brownrigg
On Fri, 20 Nov 2009, Matthias Demuzere wrote:

Thread (4 messages)

Matthias Demuzere plot filled.contour over continent map Nov 19 Ray Brownrigg plot filled.contour over continent map Nov 19 Greg Snow plot filled.contour over continent map Nov 19 Ray Brownrigg plot filled.contour over continent map Nov 23