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並前往https://github.com/tidyverse/ggplot2/issues/3167

Issue #3167 · tidyverse/ggplot2 - geom_text puts "a" on labels

p <- ggplot(mtcars, aes(wt, mpg, label = rownames(mtcars))) # mysterious letter "a" in the legend p+ geom_text(aes(colour = factor(cyl))) ...

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