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...se positive or negative responses are important, I would like to have a vertical red line top to bottom at 0. I've experimented with dot.line, add.line to put in horizontal lines but was unsuccessful. Although the following code puts a red vertical line in, it is at the plot's left border. gedot <- function() { trellis.par.set(list(fontsize=list(text=12), dot.symbol=list(pch=c(1,4), col=c("blue","red")) )) print(dotplot(product ~ response, groups = scenario, pch=c(1,4), xlab="", ylab=NULL)) panel.abline(v=0, col="red", reference=FALSE) } Help ple...