Hello fellow listers, Can anybody show (or point to) a simple EXAMPLE using panel.refline() to draw gridlines on a log-log xyplot? The idea is to draw something like figure 8.5 in http://lmdvr.r-forge.r-project.org/figures/figures.html but with log-scaled grid lines. Thank you, Ivan Ivan Gregoretti, PhD National Institute of Diabetes and Digestive and Kidney Diseases National Institutes of Health 5 Memorial Dr, Building 5, Room 205. Bethesda, MD 20892. USA. Phone: 1-301-496-1592 Fax: 1-301-496-9878