I have a ggplot figure with a couple of boxplots and I want the last boxplot in each group (in my example all boxplots c) to be shown on a different y-axis on the right hand side (and preferably mark that by the color of the boxplot). The boxplots c show a different measurement which can drastically vary with regard to order of magnitude and are measured on a different unit, so it doesn’t make sense for them to share the axis with a and b. (In my example I changed the definition of a boxplot with the functions o and f.)