In R, 'plot.margin' refers to the space around a plot, defined in the theme settings of a ggplot2 graphic. It allows users to customize the margins of their plots to create better visual clarity and ensure that text, labels, or other elements do not overlap with the edges of the plotting area. Adjusting these margins can enhance the overall presentation and readability of plots, making it an essential aspect of customizing plot aesthetics and themes.
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