Explanation for binary files inside source package according to
  https://lists.debian.org/debian-devel/2013/09/msg00332.html

Files: data/students.rda
Documented: man/students.Rd
  Data collected during 2004 and 2005 from students in statistics classes 
 at a large state university in the northeastern United States.

 -- Andreas Tille <tille@debian.org>  Sat, 12 Feb 2022 08:44:28 +0100
