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