See ggplot2::scale_alpha() for details.
scale_pattern_alpha_continuous(..., range = c(0.1, 1))scale_pattern_alpha_discrete(...)
scale_pattern_alpha_ordinal(..., range = c(0.1, 1))
Other arguments passed on to [continuous_scale()], [binned_scale], or [discrete_scale()] as appropriate, to control name, limits, breaks, labels and so forth.
Output range of alpha values. Must lie between 0 and 1.