// blue triangle
// x y dy
15.700000	0.998790	0.001354
28.799999	1.001767	0.001358
49.299999	0.998659	0.001340
78.300003	1.001046	0.001369
117.099998	0.999479	0.001359
167.600006	1.000306	0.001300
234.199997	1.000050	0.001298
298.600006	1.000252	0.001803
350.600006	1.001050	0.001824