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The proportionality constant which converts CO emission line brightness to molecular hydrogen mass.

Additional definitions for 'X factor':

X factorAn unknown or hard-to-define influence; a factor with unknown or unforeseeable consequences.
X factorprothrombinase, also called factor X.
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"X factor." Phrases.net. STANDS4 LLC, 2018. Web. 24 Feb. 2018. <http://www.phrases.net/phrase/x-factor_15885>.

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