Help Online - Quick Help - FAQ-155 How do I combine multiple legends into one?
ggplot2: Change factor order in legend - Stack Overflow
ggplot2: Changing the Default Order of Legend Labels and Stacking of Data | R-bloggers
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r - Reorder legend without changing order of points on plot - Stack Overflow
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Module 2.3
ggplot legends - change labels, order and title - Stack Overflow
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