I would like to add another axis on side 4 (see code below) #order the box plot any damn way I want too order1 <- factor(as.character(x$Site), levels=c("Betty's Branch", "Stevens Creek", "North Augusta", "520", "Horse Creek", "Stan's", "place","Downstream", "IP", "Vogtle", "301", "Clyo")) #Chloride #add BC boxplot f <- boxplot(Chloride~order, data=e, names=c("","","","","","","","","","","",""), xaxt="n", yaxt="n") par(new=T) d <- boxplot(Chloride~order, data=x, main="Chloride", ylab="mg/L", names=c("215", "SC", "202", "198", "HC", "190", "BC", "185", "179", "148", "119", "61"), plot=F) boxplot(Chloride~order1, data=x, main="Chloride", ylab="mg/L", names=c("215", "SC", "202", "198", "HC", "190", "BC", "185", "179", "148", "119", "61")) mtext(paste("(n=", d$n, ")", sep = ""), at = seq_along(d$n), line = 2, side = 1, cex=0.66) axis(4,at=c(0,50,100,150,200,300), labels=T) par(new=F) -- Let's not spend our time and resources thinking about things that are so little or so large that all they really do for us is puff us up and make us feel like gods. We are mammals, and have not exhausted the annoying little problems of being mammals. -K. Mullis [[alternative HTML version deleted]]