Tags / legend
Removing the Color Scale Legend from Plot() of SPP Density in R: A Step-by-Step Solution
Understanding the Legend Not Appearing for ggplot Geom_point Color Aesthetics: Solutions for Missing Values
Adding Boxes for NA Values in ggplot2 Legends for Continuous Maps
Creating a Fake Legend in ggplot: A Step-by-Step Guide Using qplot() and grid.arrange()