Question: Physical size of a plot

How do I change the size of a plot programmatically from the default size? I can do it by clicking the plot and pulling the borders with the mouse, but not programmatically. When using an embedded plot, one can easily define the the size of the plot component in the x- and y-direction (pixelheight, pixelwidth) using SetProperty from the DocumentTools package. I would like to do the same thing for a regular Maple plot, but have been unable to find the right command. Is it possible to do that? Thank you for the help. Peter
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