How to I go about adding a legend to the following plot? ggplot() + geom_line(aes(x=df2010$Price,y=df2010$percentCapacity), colour = "red") + geom_line(aes(x=df2011$Price,y=df2011$percentCapacity), colour = "green") +geom_line(aes(x=df2012$Price,y=df2012$percentCapacity), colour = "blue") +scale_x_log10()
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