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...e either exactly the same, or they simply don't plot at all. I made sure that in each iteration the "datasub" and "factorsub" are different ... Could you please help me? Thanks a lot! I did my homework and followed the following advice: http://stackoverflow.com/questions/1249548/side-by-side-plots-with-ggplot2-in-r my.multiplot <- function(..., plotlist=NULL, cols) { require(grid) # Make a list from the ... arguments and plotlist plots <- c(list(...), plotlist) numPlots = length(plots) # Make the panel plotCols = cols...