Module 2.3
Is there a way to change the spacing between legend items in ggplot2? - Stack Overflow
A ggplot2 Tutorial for Beautiful Plotting in R - Cédric Scherer
Center-align legend title and legend keys in ggplot2 for long legend titles - Stack Overflow
Legend colorbar is truncated and limits not respected with continuous scales - Stack Overflow
Data Visualization
How do I add a custom scale to a legend in ggplot2? - Stack Overflow
White space between tiles in heatplot ggplot - Stack Overflow
Scales, axes and legends
Scales, axes and legends
Module 2.3
What is ggtern? - ggtern: ternary diagrams in R
How to reverse legend (labels and color) so high value starts downstairs? - Stack Overflow
Ch6 Scales, axes and legends
Label minimum and maximum of scale fill gradient legend with text: ggplot2 - Stack Overflow
ggplot scale_fill_gradient2 "stopping" at midpoint - Stack Overflow
ggplot scale_fill_gradient2 "stopping" at midpoint - Stack Overflow
Sea surface temperature gradient as background to ggplot : Rlanguage
A ggplot2 Tutorial for Beautiful Plotting in R - Cédric Scherer
Manipulating the legend of scale_fill_gradient2 - Stack Overflow
Scales, axes and legends
ggplot2: Legend is missing despite scale_fill_manual() : rstats
