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Ggplot2: Change legend title while controlling line types and colors - tidyverse - RStudio Community
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ggplot2 - ggplot - Change legend title and increase keysize - By Microsoft Award MVP in 30 Sec | wikitechy
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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
![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-guide-remove-legend.png)