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Phase velocity. http://en.wikipedia.org/. http://en.wikipedia.org/. http://en.wikipedia.org/. Group velocity. http://en.wikipedia.org/. http://en.wikipedia.org/. http://en.wikipedia.org/. http://en.wikipedia.org/. http://en.wikipedia.org/. http://en.wikipedia.org/.
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Phase velocity http://en.wikipedia.org/
Group velocity http://en.wikipedia.org/