I've read ?plot, ?plot.default, and ?plot.window to learn how to change the shape of the plot from a square to a rectangle. plot.window suggests that the aspect (asp) parameter is appropriate but that associates the x axis size to the value of the y axis and, plot.window suggests that it is better to make such adjustments with plot itself. My Web searches have not found examples of how to do this. For most plots, the square shape is suitable; for time series plots I'd prefer a rectangular shape specifying the lengths of the x and y axes. Please point me to the docs that will teach me how to do this. TIA, Rich