Added least square fit and other minor changes to day1/session4.
0. 0.
0.25 0.47775
0.5 0.931
0.75 1.35975
1. 1.764
1.25 2.14375
1.5 2.499
1.75 2.82975
2. 3.136
2.25 3.41775
2.5 3.675
2.75 3.90775
3. 4.116
3.25 4.29975
3.5 4.459
3.75 4.59375
4. 4.704
4.25 4.78975
4.5 4.851
4.75 4.88775
5. 4.9
5.25 4.88775
5.5 4.851
5.75 4.78975
6. 4.704
6.25 4.59375
6.5 4.459
6.75 4.29975
7. 4.116
7.25 3.90775
7.5 3.675
7.75 3.41775
8. 3.136
8.25 2.82975
8.5 2.499
8.75 2.14375
9. 1.764
9.25 1.35975
9.5 0.931
9.75 0.47775
10. 0.