Hi, does anyone know the character table for the inversion group?

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hi, does anyone know the character table for the inversion group?
 
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Google 'character tables point groups'.
 
Could someone inform me as to what an inversion group is, or apparently the (as in unique) inversion group is. I've googled and can't find anything useful other than some references by chemical engineers, and that other google hint comes up wioth point groups - which one of those sepcifically *the* inversion group?
 

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