Use the DELETE_ROW operation to delete a row of control points of a surface.
Click the icon and then click on any control point in one of the orthogonal projection views. The row of control points corresponding to the clicked point will be deleted.
A row can only be deleted if, after it is deleted, sufficient rows of control points remain to compute the surface.
Switch between orthogonal projection views and continue deleting.
Click the icon again to disable the DELETE_ROW mode.
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