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On the Draw toolbar, click Mask .
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Use the options on the Mask ribbon to specify the following:
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Style, color, line type and width of the boundary object of the mask.
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Placement mode of the mask - you can select rectangular mask, circular mask, or polygonal mask.
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The text that displays in the label.
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Whether the border is shown or hidden.
If Show Border is unchecked, the color setting is ignored, and the border object color is set to "blank".
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Click once in the drawing to indicate the start point for the mask.
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Do one of the following:
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For rectangular and circular masks, click a second point in the drawing to place the mask
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For a polygonal mask, each click places a vertex for the mask. To finish placing vertices, right-click to place the mask in the drawing.
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If you entered text in the Caption box, the software automatically places a label in the center of the mask area.
To exit the command, press Esc.