Using the example in the boxplot documentation: data(InsectSprays) I'd like to create two boxplots (one on top of the other) the first showing the stats for the full data-set and the second showing the stats for a subset. For the sake of example assume I want to show in the bottom plot the dist for only points with count>6. I set it up as follows: layout(matrix(c(1,2,),2,1)) boxplot(count ~ spray, data = InsectSprays) boxplot(count ~ spray, data = InsectSprays, subset=count>6) However, notice the bottom boxplot's x-axis is different from the upper boxplot's x-axis. This is because E isn't represented in the subset. How can I create the bottom boxplot such that E is included but empty, allowing top and bottom plots to line-up for comparison? pete