Smoothing a segment of the curve makes the curve flatter - reducing its peaks and troughs.

To smooth a segment of the curve:

1.   Select the keyframe at the start of the segment you want to smooth.
2.   Right-click and select Transform > Smooth... .

The Smooth dialog displays.

3.   Change the values within the dialog where appropriate:

Step Size - how often to create a keyframe.

Radius - how much to smooth the curve (higher values for smoother, lower values for closer to original).

Filter - which algorithm to use, Triangle or Box.

4.   Click Apply to smooth the curve.

Note:  For the best results, smooth multiple segments at once by selecting a number of keyframes together.

Smoothing with the default settings:
Step Size
4, Radius 2, and Triangle
Filter
(the original curve is ghosted
out).

Smoothing with Step Size 2 and
Radius
4.

Step Size 5 and Radius 2.

Step Size 4 and Radius 4.