Copy and paste small data sets into R

How can I embed a small data set into my R code? That was the question I came across today, when I prepared my talk about Dynamical Systems in R with simecol for the forthcoming Cologne R user group meeting. I wanted to add all the R code of the talk to the last slide. That’s easy, but the presentation makes use of a small data set of 3 columns and 21 rows.