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

Files: data/digits.RData
Documented: man/digits.Rd
  Subsampled MNIST database of handwritten digits. This smaller dataset has 3000 samples for each of the digits corresponding to the class labels 0,1,2,3. Each 28x28 image patch is stored as a flattened row vector.

Files: data/tiger.RData
Documented: man/tiger.Rd
  1600x1200 grayscaled (8 bit [0-255]/255) image. xamples{

 -- Steffen Moeller <moeller@debian.org>  Mon, 12 Aug 2019 15:05:01 +0200
