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並前往https://coderedirect.com/questions/149289/add-a-horizontal-line-to-plot-and-legend-in-ggplot2

Add a horizontal line to plot and legend in ggplot2 - Code ...

I can add the line with geom_line but cannot get the line in the legend. library(ggplot2) the.data <- read.table( header=TRUE, sep=",", text="source, ...

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