Nothing
fleches <- function(x=TRUE,y=TRUE){
extr <- par("usr")
if (isTRUE(x)) arrows(extr[1],extr[3],extr[2]+0.05*diff(extr[1:2]),extr[3],
xpd=T,length=0.1)
if (isTRUE(y)) arrows(extr[1],extr[3],extr[1],extr[4]+0.05*diff(extr[3:4]),
xpd=T,length=0.1)
}
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