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

Files: data/potatoes.rda
Documented: man/potatoes.Rd
  Fisher's Potato Crop Data

 -- Andreas Tille <tille@debian.org>  Sun, 22 Oct 2017 22:45:06 +0200
