Makes the selected curves (or selected CVs) smoother. The curve’s first and last CVs will maintain their original positions.
Related topics
Edit Curves > Modify Curves > Smooth > 
- Smooth Factor
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Determines how much each segment of the selected curves will be smoothed. The higher the Smooth Factor, the greater the effect. The effect will be greater on a curve with many CVs, than on a curve with few CVs, because the Smooth Factor affects each segment.