Nothing
p.grid <- function(grid, ...){
myhead <- grid$head
tab <- grid$tab
x=seq(from=myhead[3], by=myhead[5], length.out=myhead[1])
y=seq(from=myhead[4], by=myhead[5], length.out=myhead[2])
filled.contour(x=x,y=y,as.matrix(tab),
asp=1,
#color.palette=topo.colors,
#zlim=c(-20,20),
plot.axes={axis(1);axis(2)},
... )
}
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