y	x1	x2	center
40	-1	1	0
41.5	1	1	0
39.3	-1	-1	0
40.9	1	-1	0
40.3	0	0	1
40.5	0	0	1
40.7	0	0	1
40.2	0	0	1
40.6	0	0	1