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These objects are imported from other packages. Follow the links below to see their documentation.

grid

arrow, unit

scales

alpha

Examples

ggplot(mpg, aes(displ, hwy)) +
  geom_point(alpha = 0.5, colour = "blue")


ggplot(mpg, aes(displ, hwy)) +
  geom_point(colour = alpha("blue", 0.5))