C06FXF Example Program Data
  2 3 4                                    :  n1, n2, n3
     1.000     0.999     0.987     0.936
     0.000    -0.040    -0.159    -0.352
     0.994     0.989     0.963     0.891
    -0.111    -0.151    -0.268    -0.454
     0.903     0.885     0.823     0.694
    -0.430    -0.466    -0.568    -0.720
     0.500     0.499     0.487     0.436
     0.500     0.040     0.159     0.352
     0.494     0.489     0.463     0.391
     0.111     0.151     0.268     0.454
     0.403     0.385     0.323     0.194
     0.430     0.466     0.568     0.720   :  x, y