t       y       sigma
0.	13.0	0.3
1.	3.2	0.4
2.	3.2	0.5
3.	4.8	0.6
4.	4.4	0.6
5.	4.7	0.7
6.	7.1	0.7
7.	8.7	0.8
8.	7.8	0.8
9.	9.1	0.9
10.	11.5	0.9