[R] all (y,x) data in one plot

[Judy Chung]

Dear R users:
   I want to plot all the Y1 vs. X1 which in list "coffee" together,
in the same plot.
> coffee
[[1]]
  Y1        X1
1  0.0 10.006306
2  0.5  9.433443
3  1.0  8.893405
4  2.0  7.904274

[[2]]
  Y1        X1
1  0.0 10.015972
2  0.5  9.460064
3  1.0  8.935039
4  2.0  7.970755

[[3]]
  Y1       X1
1  0.0 9.985741
2  0.5 9.552583
3  1.0 9.138239
4  2.0 8.362664

[[4]]
.......

[[5]]
.......

> x1<-coffee[[1]]$Y1
> y1<-coffee[[1]]$X1
> x2<-coffee[[2]]$Y1
> y2<-coffee[[2]]$X1
> x3<-coffee[[3]]$Y1
> y3<-coffee[[3]]$X1
.....
> plot(y1~x1)
> points(y2~x2)
> points(y3~x3)
.......
Because I am a newbie in R, so I just can use the above method to
solve the problem.
If there is a smarter way to this.
Thanks for any help.