R语言 怎么把两个散点图画在一起

vd2=c(-16.3,-12.2,-8.2,-3.9,0,5.9,9.7,13.2,18.1)
vd1=c(-16.6,-12.5,-8.8,-4.2,0,6,9.8,15,18.2)
y=c(-16,-12,-8,-4,0,4,8,12,16)
plot(y~vd1)
plot(y~vd2,col="red")
怎么才能吧这两个散点图画到一起啊

require(ggplot2)
vd = rbind(data.frame(v=vd1, y=y, t=as.factor(1)), data.frame(v=vd2, y=y, t=as.factor(0)))
ggplot(vd, aes(x=v, y=y)) + geom_point(aes(color=t))
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