I Center of inversion of cubic diamond structure?

IcedCoffee
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I'm having hard time finding the center of inversion of cubic diamond structure.

upload_2018-11-20_17-53-41.png


At first I thought (2,2,2) would be the center of inversion, but (1,1,3), (3,3,3), (1,3,1), (3,1,1) (i.e. four atoms inside the cube) are not centrosymmetric about (2,2,2).
 

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Ah, I see. It's on a midpoint between two atoms like (2.5, 1.5, 0.5)...
 
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