R Tutorial 2.2 - missing code

[hardin47]

contact_reason → typo
book → ims
feedback_type → other
contact_name → Mike Keim
contact_email → mkeim@putneyschool.org
reply_needed → no_but_okay

This page in the R tutorials: https://openintro.shinyapps.io/ims-02-explore-02/#section-colored-density-plots
seems to be missing a little section of code after the lines that read "Putting this all together, our code looks like:"
I think something has been run to filter ncyl down to 4,6 and 8, but the code itself is not visible in the tutorial.