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How To Easily Customize GGPlot Legend for Great Graphics - Datanovia
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ggplot2 legend : Easy steps to change the position and the appearance of a graph legend in R software - Easy Guides - Wiki - STHDA
Change Legend Title in ggplot2 (2 Examples) | Modify ggplot Legends Text
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Changing the legend title changes the continuous scale to categorical. · Issue #3187 · tidyverse/ggplot2 · GitHub
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