Highlight Region Between Two ggplot2 Lines with Color in R (Example Code)

In this tutorial you’ll learn how to highlight the region between two ggplot2 lines with color in the R programming language.

Setting up the Example

data(iris)                     # Loading example data
head(iris)
#   Sepal.Length Sepal.Width Petal.Length Petal.Width Species
# 1          5.1         3.5          1.4         0.2  setosa
# 2          4.9         3.0          1.4         0.2  setosa
# 3          4.7         3.2          1.3         0.2  setosa
# 4          4.6         3.1          1.5         0.2  setosa
# 5          5.0         3.6          1.4         0.2  setosa
# 6          5.4         3.9          1.7         0.4  setosa
install.packages("ggplot2")    # Install & load ggplot2 package
library("ggplot2")
my_plot <- ggplot(iris,        # Drawing a ggplot2 line plot
                  aes(x = 1:nrow(iris))) +
  geom_line(aes(y = Sepal.Length)) +
  geom_line(aes(y = Petal.Length))
my_plot

r graph figure 1 highlight region between two ggplot2 lines color r

Example: Highlighting the Area Between Two Lines in a ggplot2 Line Plot

my_plot +                      # Adding color between multiple lines
  geom_ribbon(aes(x = 1:nrow(iris),
                  ymin = Sepal.Length,
                  ymax = Petal.Length),
              fill = "purple")

r graph figure 2 highlight region between two ggplot2 lines color r

Related Tutorials

Please have a look at the following R tutorials. They illustrate topics such as text elements, colors, and lines:

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