D03ECF Example Program Data
  4 5 6 18                    : n1, n2, n3, itmax
  0.0 1.0 3.0 6.0             : x
  0.0 1.0 3.0 6.0 10.0        : y
  0.0 1.0 3.0 6.0 10.0, 15.0  : z
  0.1E-5 0.1E-5               : conres, conchn
  1                           : ndir