Nothing

```
ellipses <-
function(x0,y0,w,h,n=100, cols, ...){
np=length(x0)
x=seq(-w,w,length=n/2)
y=(1-(x/w)^2)^.5*h
x=c(x,rev(x))
y=c(y,-rev(y))
x0=matrix(rep(x0, each=n), nrow=n)
y0=matrix(rep(y0, each=n), nrow=n)
x <- x0 + x
y <- y0 + y
for(i in 1:np) polygon(x[,i], y[,i], col=cols[i], ...)
return(list(x,y))
}
```

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