// red triangle
// x y dy
15.700000	1.001668	0.001355
28.799999	1.001408	0.001361
49.299999	0.999825	0.001345
78.300003	1.000819	0.001383
117.099998	1.000149	0.001408
167.600006	1.001646	0.001339
234.199997	0.999151	0.001299
298.600006	1.000413	0.001801
350.600006	1.002915	0.001827