[R] how to plot image() without painting a map (the background)

[Ptit_Bleu]

Hello,

I'm trying to plot dayly evolution of the temperature over France from
Global Forecast System files ("I'm trying" is the right expression...).

akilonlat03 is the temperature for different latitudes and longitudes à 3
o'clock.
akilonlat06 is the temperature for different latitudes and longitudes à 6
o'clock.

I would like to plot akilonlat03 and then akilonlat06 and keep the map of
France in background.
My script (see below) doesn't work as image "paints" the background as I
read somewhere in this forum.

So would have someone a solution to correct my script ?
Thanks in advance,
Ptit Bleu.

----------------------------------------------------


akilonlat03<-interp(lonlat03$Longitude, lonlat03$Latitude,
(5/9)*(lonlat03$TMP_200802150300-32))
akilonlat06<-interp(lonlat06$Longitude, lonlat06$Latitude,
(5/9)*(lonlat06$TMP_200802150600-32))

map('france')

image(akilonlat03, col=cm.colors(100), axes=FALSE, add=TRUE)
#contour(akilonlat03, col="blue", add=TRUE)
image(akilonlat06, col=cm.colors(100), axes=FALSE, add=TRUE)
#contour(akilonlat06, col="blue", add=TRUE)

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