step_ahead,prediction
1,4.705814725071166
2,4.529782580450795
3,4.896136333953198
4,4.724613787688887
5,4.753467132385231
6,4.5664167508575
7,4.875593212740093
8,4.550227945760906
9,4.308752013827096
10,4.73750940436351
11,4.66216933805124
12,4.8941882123396345
13,4.439606744025333
14,4.675223346497117
15,4.757512244442766