#  data_columns.txt
#
  0.0  10.0  3.0  12.0
  1.0   9.0  4.0  13.0
  2.0   7.0  7.0  13.0
  3.0   3.0  8.0  11.0
  6.0   1.0  3.0  15.0
  7.0   2.0  2.0  18.0
  7.5   4.0  1.0  21.0
  8.0   6.2  0.0  24.2
  8.5   5.3  0.0  24.3
  9.0   4.2  0.0  24.2
 10.0   1.0  0.0  22.0