Dear list members, I create a pdf file with a number of barplots and histograms: pdf(file=my.pdf.file, paper="a4", width=6, height=10) ... dev.off() Then I run a model and plot fitted vs residuals and interactively (using identify()) label some of the residuals on that plot. After that I want to append this interactive plot to the already existing PDF file. How can I do that? I tried opening new device with x11() then plotting fitted vs residuals in it and then (since pdf device is still open) dev.copy(dev.cur(), which=dev.prev()) but this produces error message : Error in dev.copy(dev.cur(), which = dev.prev()) : cannot supply 'which' and 'device' at the same time and when I close off the devices, my PDF file contains only barplots and histograms. Could someone please instruct me? Thank you in advance for your time and help. -- Jonas Malmros Stockholm University Stockholm, Sweden