Facet Wrap Plot: Adding Floating Axis Labels for Evenly Spaced X-Axis Ticks

Customizing Facet Grid Legends with ggplot2: A Step-by-Step Solution for Dynamic Variable Names

Creating Facet Grids with Free Scales for Aesthetics Other Than X and Y in ggplot2

Adding Separate Text to Each Bar in Facet Wrap: A Solution for Duplicate Labels