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Vectorised in both colour and alpha.
alpha(colour, alpha = NA)
colour
new alpha level in [0,1]. If alpha is NA, existing alpha values are preserved.
NA
alpha("red", 0.1) alpha(colours(), 0.5) alpha("red", seq(0, 1, length.out = 10)) alpha(c("first" = "gold", "second" = "lightgray", "third" = "#cd7f32"), .5)
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