9.7

• When manually setting aesthetic propoerties, we need to pick a value that makes sense for that aesthetic:
  • The name of a color as a character string, e.g., color = “blue”
  • The size of a point in mm, e.g., size = 1
  • The shape of a point as a number, e.g, shape = 1, as shown below.
• We can learn more about aesthetics mapping by looking at this vignettes aesthetic specifications vignette