add_legend <- function(...) {
opar <- graphics::par(fig=c(0, 1, 0, 1), oma=c(0, 0, 0, 0),
mar=c(0, 0, 0, 0), new=TRUE)
on.exit(graphics::par(opar))
graphics::plot(0, 0, type='n', bty='n', xaxt='n', yaxt='n')
graphics::legend(...)
}
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