I have a ggplot, which also displays a legend:
ggplot(dt.m, aes(x=pct.on.OAC.cont,y=Number.of.Practices, fill=Age.Group)) +
geom_bar(stat="identity",position=position_dodge())
When I add another line, I also get a second legend:
geom_smooth(aes(x=pct.on.OAC.cont,y=Number.of.Practices, colour=Age.Group), se=F, alpha=0.5)
How can I prevent the second legend from displaying ?