points
(
    (0     0       0)
    (0.45  0.70707 0)
    (0.9   1 0      )
    (1.35  0.70707 0)
    (1.8   0 0      )
    (2.25 -0.70707 0)
    (2.7  -1 0      )
    (3.15 -0.70707 0)
    (3.6   0       0)
);

grading 1;

n 100;
