What does XSUM stand for?

What does XSUM mean? This page is about the various possible meanings of the acronym, abbreviation, shorthand or slang term: XSUM.

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Clapack File

Computing » File Extensions

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"XSUM." Abbreviations.com. STANDS4 LLC, 2015. Web. 5 Mar. 2015. <http://www.abbreviations.com/XSUM>.

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