id length time Y_new X
1  2      1    1     1 2
2  3      4    1     0 3
3  3      4    2     0 3
4  3      4    3     0 3
5  3      4    4     1 3
6  4      3    1     0 6
7  4      3    2     0 6
8  4      3    3     1 6