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Normal tube
editI hope this definition helps the cause. Iswyn 02:33, 22 May 2007 (UTC)
I just edited this new page for style. In reading it over, I noticed that the "normal tube" is not defined. I'd add a definition myself, but I'm not certain exactly what it means.
Adding a definition of a "normal tube" would probably clarify this article for the general reader. DavidCBryant 14:48, 21 May 2007 (UTC)