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From the Surface section of the action bar, click Tubing
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Select the curve as Guide, enter a Radius and click Apply.
A tube surface touching the x axis of the moving frame will be displayed. The surface begins in the origin on the x axis, and ends parallel to the y axis. 
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Select Center and Close and click Apply.
The tube surface is created around the guide curve. 
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Clear Center, select Blend and click Apply.
A tube surface touching the x or y axis of the local coordinate system is created. 
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Clear Close and click Apply.
A tube surface touching the x or y axis of the local coordinate system is created. This surface begins in the touching point on the x axis, and ends in the touching point on the y axis. 
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Specify a Distance and click Apply.
A tube surface touching the x axis of the local coordinate system and having a distance 10 from the y axis is created. The surface begins in the touching point on the x axis, and ends parallel to the y axis. 
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