[R] Add arrows to a filled.contour margin

[Ronaldo Reis Junior]

Hi,

I try to put an arrow to a filled.contour plot. I make this:

filled.contour(volcano, color = terrain.colors,key.axes=F)
arrows(0.95,0,0.95,1,lwd=2)

This work, but the problem is that I find the coordinates at random try, for 
other graphic with other scale is other fight with coordinates. Anybody know 
a more easy  or more generalized way to make this? Somethink like this 
mtext(arrows(),side=4).

Thanks
Ronaldo
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> Prof. Ronaldo Reis Júnior
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