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Hi all. I want to generate a sequence of n plots and save them into a single PDF file, one plot per page. From the R docs and other sources I gather the basic way to do this is save plot 1 into a file then append the 2:n plots to the same file.  This code shows my basic approach, but for some reason only the last plot is saved into the pdf. I've tried different variations (e.g. using onefile