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Customize Legend of plotly Graph in R (Example) | Modify & Change | Title, Font Family, Size & Color
Add Legend to Plot in Base R (8 Examples) | Change Position, Color, Size, Shape of Point & Line Type
R : How to change the size of legend text in ggplot2?
R : Adjust position and font size of legend title in ggplot2
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How To... Add a Legend to a Matrix Plot in R #58
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Change Legend Labels of ggplot2 Plot in R (2 Examples) | Modify Item Text | scale_color_manual()
Move Position of Barplot Legend in R (Example) | Change Barchart Location | legend.text, args.legend
Add or change legend names while using qplot (Data Visualization Basics in R #4)