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Relax Property Editor

Adjusts the proportions of selected polygons in UV space to resemble their proportions in 3D space. This can help remove distortions of the selected sample points.

Iterations	Controls the number of times that the relaxation is run. More iterations usually yields a better result.
Increment	Adds a "damping" factor. If the points tend to diverge instead of converging to a rest state, decreasing the increment can help.
Anchor Boundary	When Activated, the points on the contour of the selection are anchor points (they don't move) and the other selected points are adjusted to fit the 3D polygon proportions.

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