One R Tip A Day: Two plot with a common legend - base graphics
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Add legends to plots in R software : the easiest way! - Easy Guides - Wiki - STHDA
R plot() Function (Add Titles, Labels, Change Colors and Overlaying Pots)
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Add Legend to a plot - legend() Function in R - DataScience Made Simple
Add legends to plots in R software : the easiest way! - Easy Guides - Wiki - STHDA
