obs	x1	x2	y
1	35.3	5.2	10.98
2	29.7	5.12	11.13
3	30.8	6.19	12.51
4	58.8	3.89	8.4
5	61.4	6.28	9.27
6	71.3	5.76	8.73
7	74.4	3.45	6.36
8	76.7	6.57	8.5
9	70.7	5.69	7.82
10	57.5	6.14	9.14
11	46.4	4.84	8.24
12	28.9	4.88	12.19
13	28.1	6.03	11.88
14	39.1	4.55	9.57
15	46.8	5.71	10.94
16	48.5	5.67	9.58
17	59.3	6.72	10.09
18	70	4.95	8.11
19	70	4.62	6.83
20	74.5	6.6	8.88
21	72.1	5.01	7.68
22	58.1	5.68	8.47
23	44.6	5.28	8.86
24	33.4	5.36	10.36
25	28.6	5.87	11.08