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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
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R Change Display Order of ggplot2 Plot Legend (Example) | Sort Items Manually Using factor Function - YouTube
![ggplot2 legend : Easy steps to change the position and the appearance of a graph legend in R software - Easy Guides - Wiki - STHDA ggplot2 legend : Easy steps to change the position and the appearance of a graph legend in R software - Easy Guides - Wiki - STHDA](http://www.sthda.com/sthda/RDoc/figure/ggplot2/ggplot2-legend-order-multiple-guides.png)
ggplot2 legend : Easy steps to change the position and the appearance of a graph legend in R software - Easy Guides - Wiki - STHDA
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