[R] geom_ribbon function in ggplot2 package

[John]

Hi,

   When using the geom_ribbon function in gglot2 package, I got the text
"fill" above the legend "A" and "B". How can I get rid of the text "fill"
above the legend?

   Thanks!

The code is as follows:


df<-data.frame(x=c(1,2), y=c(1,2), z=c(3,5))
> ggplot(df,
aes(1:2))+geom_ribbon(aes(ymin=0,ymax=df[,"y"],fill="A"),alpha=0.5)+geom_ribbon(aes(ymin=0,ymax=df[,"z"],fill="B"),alpha=0.5)

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