Smooth curve
From TOI-Pedia
Smoothing is a method to blend the different curvatures of a curve, resulting in a smoother curve. Smoothing works on the whole curve or the selected vertices of the curve. To use the smooth option select Edit Curves > Smooth Curve. In the Option Box you can select the smoothness (ie: the distance over which smoothing occurs). Align curves is a related command, but only works at the ends of two curves that meet.
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