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Hi all: I need to put bold font in the y label, which is an expression at the same time When putting font.lab=2 in plot, it only puts bold font for the x axis label.. what should I do? Thanks very much plot(jitter(c(1, 4, 7, 9, 11, 13), a=0.1), y = Bllim.m, xlab = "Week", ylab = expression(paste("B removal rate", " (mg/m"^{3}, "-d)")),font.lab=2, ylim = c(-1000,9000), xlim = c(0, 14), pch = 22, axes= FALSE, cex = 0.1) Kathy [[alternative HTML version deleted]]