D03UBF Example Program Data
 4  5  6  10                      : n1, n2, n3, nits
 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