D03EBF Example Program Data
  6 10 18                     : n1, n2, itmax
  0.0 1.0 3.0 6.0 10.0 15.0   : x
  0.0 1.0 3.0 6.0 10.0
  15.0 21.0 28.0 36.0 45.0    : y
  0.1E-5 0.1E-5               : conres, conchn
  1                           : ndir