Layering is the mechanism by which additional data elements are added to a plot. Each layer can come from a different dataset and have a different aesthetic mapping, allowing us to create plots that could not be generated using qplot(), which permits only a single dataset and a single set of aesthetic mappings.
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© 2009 Springer-Verlag New York
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Wickham, H. (2009). Build a plot layer by layer. In: ggplot2. Use R. Springer, New York, NY. https://doi.org/10.1007/978-0-387-98141-3_4
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DOI: https://doi.org/10.1007/978-0-387-98141-3_4
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