Using Labeller to Automatically Add Units to Strip Labels in ggplot2 Facet Wrap Plots: A Practical Guide

Customizing Data Formats in Different Facets of a ggplot2 Plot

Understanding Scales in Facet Grid and Facet Wrap: A Key to Effective Faceting in ggplot2

Faceting Text on Individual Panels in ggplot2: A Customizable Annotation Solution