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

Files: data/nile.rda
Documented: man/nile.Rd
  Nile overflow data

Files: data/titanium.rda
Documented: man/titanium.Rd
  Titanium Test Data

Files: data/brown72.rda
Documented: man/brown72.Rd
  Brownian Motion

 -- Andreas Tille <tille@debian.org>  Thu, 13 Sep 2018 21:39:16 +0200
