when I export a RStudio generated figure as image it works fine (attached png file)
plot(2,3, ylab="cannot export as I see it",
xlab= expression(paste(delta^{13}, "C (\u2030)")))
but when I try to export the same figure as a pdf, the x-label expression within bracket gets distorted (also attached)!! is there a solution?
dev.copy2pdf(file="export.pdf", width = 3, height = 3.5)