ENH: Minor cleanup. Also added slide to introduce IPython's %timeit and
%time.
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.