geom_null(mapping = NULL, data = NULL, stat = "identity", position = "identity", na.rm = FALSE, show.legend = FALSE, inherit.aes = TRUE, ...)FALSE (the default), removes missing values with a
warning. If TRUE silently removes missing values.NA, the default, includes if any aesthetics are mapped. FALSE
never includes, and TRUE always includes.FALSE, overrides the default aesthetics, rather
than combining with them. This is most useful for helper functions that
define both data and aesthetics and shouldn't inherit behaviour from the
default plot specification, e.g. borders.layer. There are three
types of arguments you can use here:
color = "red" or size = 3. stat associated with the
layer.