Nothing
plot.yplocation <- function(x, add=FALSE, col="black", ...){
r <- require(maps)
if(!r) stop("Need to install package 'maps' to plot a Yplant location.")
if(!add)map('world', col=col, ...)
points(x$long, x$lat, pch=19, col="red", cex=1.1)
}
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