step_ahead,prediction
1,28.496643
2,28.404678
3,28.30959
4,28.383665
5,28.593033
6,28.209555
7,28.16047
8,28.564787
9,28.430775
10,28.59147
11,28.464535
12,28.429003
13,28.3995
14,28.610317
15,28.454191