Before you begin, make sure that the appropriate data is selected in the "Active Data" Selector.
1. Click the button.
2. If one or more contours are currently "selected" (indicated by small black squares on their vertices), deselect them by clicking on any white space.
3. Select the contour to be deleted by clicking on it. To select multiple boundaries, hold down the "Ctrl" key and successively click on each boundary. To select all contours, click the "Edit" menu and select "Select All".
4. Click the "Edit" menu and select "Delete", or press the "Del" key.
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