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The margins should allow for the axes of the plots to be plottet plotted in the margins. Also if the so called "Gray Frame" is used, the margins should be set to a little bit larger than the grayframegray frame. The media selector has a few preset sizes a3/a4 and landscape/portrait that may be refered referred to as not scaled and a Scale 1: which will give a scaled plot.Now, let us put something onto the plot. It is advisable to start with the easiest element first which in this case is the axes.