[R-sig-Geo] plot border

[Muhammad Rahiz]

Hi all,

When running the following script, I can plot the image.
Does anyone know how I can get the outline/border of the image? 
Sample data is attached.

Thanks - Muhammad

library(ncdf)
library(maptools)

dat <- get.var.ncdf(open.ncdf("obs.r06q7.nc"))
lon <- x0$dim[[1]]$val
lat <- x0$dim[[2]]$val
image(lon,lat,dat)
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