step_ahead,prediction
1,27.181474584341046
2,26.93903535604477
3,26.817919653654098
4,26.944166326522826
5,27.17412391901016
6,27.203247153759
7,27.117669272422788
8,26.88747416734695
9,26.901655066013333
10,27.239310646057127
11,27.09606435894966
12,27.072824800014494
13,27.180260825157163
14,27.123387038707733
15,26.771391636133192