Hi, I'm new. I tried to search out this answer but I suspect I was using the wrong terms, or simply not understanding some of the answers. Anyway here is my question: I want to have a 2x2 panel figure with 4 line graphs all in the same scale. Actually I have that. The thing I seem to be lacking is a way to Label each panel with a letter. I want it to look something like this: http://www.nature.com/npp/journal/v31/n9/images/1301015f3.gif I am using linux and I'm not even entirely sure if I've done this in a best practices sort of way but here is the code that I've entered so far to make my figure: library(sciplot) postscript('PreferenceGraph2x2.eps') par(mfrow = c(2,2), pin=c(6.45669292,6.45669292), pty="m") lineplot.CI(Week, Pref, group = Drug, data=SM.long, xlab = "Week", ylab ="Proportion Sucrose of Total Fluids", x.leg =1, y.leg=.91, leg.labc("Salvia","Control"),col =c("red","darkgreen"),ylim=c(0.48,.95), main "Preference of Stressed Males") lineplot.CI(Week, Pref, group = Drug, data=SF.long, xlab = "Week", ylab ="Proportion Sucrose of Total Fluids", x.leg =1, y.leg=.60, leg.labc("Salvia","Control"),col =c("red","darkgreen"),ylim=c(0.48,.95), main "Preference of Stressed Females") lineplot.CI(Week, Pref, group = Drug, data=NSM.long, xlab = "Week", ylab ="Proportion Sucrose of Total Fluids", x.leg =1, y.leg=.64, leg.labc("Salvia","Control"),col =c("red","darkgreen"),ylim=c(0.48,.95), main "Preference of Non-Stressed Males") lineplot.CI(Week, Pref, group = Drug, data=NSF.long, xlab = "Week", ylab ="Proportion Sucrose of Total Fluids", x.leg =1, y.leg=.64, leg.labc("Salvia","Control"),col =c("red","darkgreen"),ylim=c(0.48,.95), main "Preference of Non-Stressed Females") dev.off() Thanks in advanced for any help you might give! -- View this message in context: http://r.789695.n4.nabble.com/Help-labeling-Panels-tp3409528p3409528.html Sent from the R help mailing list archive at Nabble.com.