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add alpha levels to scale_*_gradientn · Issue #2361 · tidyverse/ggplot2 · GitHub
alpha and fill legends in ggplot2 boxplots? - Stack Overflow
Function Reference: legend
Scatter plots with a legend — Matplotlib 3.1.0 documentation
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Controlling legend appearance in ggplot2 with override.aes
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Controlling legend appearance in ggplot2 with override.aes
Building a nice legend with R and ggplot2 – the R Graph Gallery
How to plot two different scales on one plot in matplotlib (with legend) - Sam Chakerian - Medium
